A former high school teacher’s former student has been accused of killing both her and their young son — born from an affair that made headlines in 2013 — a New York City police source tells PEOPLE. 
 
 An NYPD spokesperson declined to comment on the case, but the department source says Isaac Duran was charged Tuesday with two counts of murder in the deaths of former Dewitt Clinton High School teacher Felicia Barahona and her 4-year-old son, Miguel. 
 
 The 36-year-old mother and Afghanistan War veteran was found dead Monday morning in the living room of her Manhattan apartment, according to the police source, who confirms that she was strangled with an electrical cord and Miguel was drowned in the bathtub. The boy was found face-down, floating in the filled tub, the source says. 
 
 Their bodies were first discovered by the apartment building’s superintendent, who checked on Barahona after noticing a foul odor that seemed to be coming from her unit. 
 
 Duran was taken into custody later Monday, according to the source. 
 
 Under “intense questioning,” PEOPLE’s source alleges that Duran “owned up” to the killings — at one point “referencing Satan.” 
 
 • Want to keep up with the latest crime coverage? Click here to get breaking crime news, ongoing trial coverage and details of intriguing unsolved cases in the True Crime Newsletter. 
 
 Duran’s custody status was not immediately available Tuesday afternoon. It was unclear from court records if he had been before a judge yet, entered a plea to his charges or whether a bail amount had been set for him. 
 
 It was unknown Tuesday if Duran had retained an attorney who could comment on his behalf. 
 
 According to the NYPD source, Duran initially denied having any involvement in the deaths and told detectives he hadn’t been to Barahona’s apartment building since 2012, when their son was born. However, police discovered that Duran was spotted on surveillance video entering and leaving the building over several days. 
 
 • Pick up PEOPLE’s special edition True Crime Stories: Cases That Shocked America, on sale now, for the latest on Casey Anthony, JonBenét Ramsey and more. 
 
 Barahona’s relationship with Duran first became public in March 2013, after an internal investigative report was obtained by multiple local news outlets. 
 
 According to those reports, Barahona began having sex with Duran after he turned 18, though they later split in early 2012 before Miguel was born. Barahona was fired from Dewitt Clinton High in August 2012. 
 
 Her family could not immediately be reached. ||||| The ex-lover of a former New York City schoolteacher has been arrested on murder charges after the woman and their 4-year-old son were found dead in her Manhattan apartment Monday. News 4's Ray Villeda reports. (Published Tuesday, Dec. 27, 2016) 
 
 What to Know The bodies of 36-year-old Felicia Barahona and her 4-year-old son were found in a Manhattan apartment Monday 
 
 Barahona was found strangled; her son was found unresponsive in a bathtub 
 
 Isaac Duran, a former student of Barahona's and the father of her baby, was arrested on murder charges 
 
 UPDATE: Ex-Student Who Fathered Teacher's Child Killed in Anger Over Boy Being Dressed in Girl's Clothing; Video Shows Him Pacing Outside Apartment on Day of Killings: NYPD 
 
 The ex-lover of a former New York City schoolteacher has been arrested on murder charges after the woman and their 4-year-old son were found dead in her Manhattan apartment Monday. 
 
 Isaac Duran Infante, 23, was taken into custody Tuesday in the deaths of 36-year-old Felicia Barahona and their 4-year-old son Miguel, and confessed to killing them, a law enforcement source told NBC 4 New York. 
 
 The medical examiner has determined Barahona died from strangulation by the electrical cord, and her son died of asphyxia from neck compression. 
 
 Ex-Lover Arrested in Deaths of Mom, Son Found in Apartment 
 
 Isaac Duran Infante, 22, the ex-lover of a former New York City schoolteacher, has been arrested on murder charges after the woman and their 4-year-old son were found dead in her Manhattan apartment Monday. (Published Tuesday, Dec. 27, 2016) 
 
 Duran Infante was a former student of Barahona's, and their son was born from their affair, which began when he was 17 years old. 
 
 A source told NBC 4 New York that Duran Infante, of Bethlehem, Pennsylvania, confessed to the double killing in part because he was dissatisfied with the way his son was being raised by Barahona. 
 
 Duran Infante said nothing to reporters as he was led in handcuffs from the police stationhouse where he was interviewed. 
 
 His anguished grandmother, who lives in the Bronx, told NBC 4 New York in Spanish she wanted justice and that she knows her grandson is innocent of the charges. 
 
 Former Student in Custody in Deaths of Ex-Schoolteacher, Son: Source 
 
 The ex-lover of a former New York City schoolteacher has confessed to killing the woman and their 4-year-old son, who was born after an affair that started while the young man was a student, a law enforcement source says. Chris Glorioso reports. (Published Tuesday, Dec. 27, 2016) 
 
 Another relative of Duran Infante, Janiel Santana, said, "It's hard to believe they're dead. When we heard the news, we thought this has got to be a mistake." 
 
 The couple shared custody of the child, relatives said. Miguel's father's side of the family was expecting to see the boy for New Year's Eve to give him his Christmas presents. 
 
 Barahona lost her job as a science teacher at DeWitt Clinton High School in 2013, shortly after she became pregnant and school administrators learned of her illicit relationship with a student. 
 
 Felicia Barahona was found dead, an electrical cord wrapped around her neck, on the living room floor of her West 153rd Street apartment in Hamilton Heights around 8:15 a.m. Monday after the building super was alerted about a smell, police said. Her son Miguel was found unresponsive in a bathtub, police said. Investigators believe the duo had been dead several days. 
 
 Boy, Mother Found Dead in Manhattan Apartment: NYPD 
 
 The bodies of a 36-year-old woman and a young boy were found inside a Manhattan apartment Monday morning, police say. (Published Monday, Dec. 26, 2016) 
 
 Neighbors described Miguel as a sweet boy. 
 
 "It's sad. It's a little life," said Elia Flores, adding of his mother, "I've known her for a lot of years that she live here." ||||| Felicia Barahona, 36, was found dead with her 4-year-old son Monday morning. View Full Caption Composite: DNAinfo/Carolina Pichardo; inset: Facebook/Felicia Barahona 
 
 HAMILTON HEIGHTS — A former student who fathered a boy with his science teacher four years ago has admitted killing her and their son in her Uptown apartment, sources told DNAinfo New York. 
 
 The suspect, Isaac Duran, 23, confessed to strangling Felicia Barahona, his former DeWitt Clinton High School teacher, with an electrical cord and fatally choking their 4-year-old son, Miguel, in the bathtub, sources said. 
 
 The bodies were found early Monday when the superintendent was alerted to a smell coming from Barahona's apartment in her West 153rd St. building near Riverside Drive. Officials believe they had been dead several days. 
 
 Barahona was discovered in the living room with an intact electrical cord wrapped around her neck. The cord was not attached to anything, there was no suicide note and no signs of forced entry at the scene, according to sources. 
 
 Barahona's cause of death was ligature strangulation and its been deemed a homicide, according to a spokeswoman for the Office of the Chief Medical Examiner. 
 
 Miguel was asphyxiated to death, killed by neck compression, the spokeswoman added. 
 
 Duran, who was picked up Monday, confessed during questioning that he killed her and the child because he said he was upset at the way his son was being dressed and raised, sources said. 
 
 He was arrested on murder charges Tuesday, police said. 
 
 Their ill-fated relationship began in 2011 when he was still a student at DeWitt Clinton High School. 
 
 Barahona, an Afghanistan war vet, was his science teacher. 
 
 After becoming friends on Facebook, Barahona took the student trick-or-treating on Halloween along with her daughter. They ate at McDonald's and visited the Disney store in Times Square during the outing, according to a 2012 report from the Special Commissioner of Investigation. 
 
 The report says that Barahona later invited Duran to her home on his birthday, where they had the first of what would be several sexual encounters. The teacher told the teenager not to worry about condoms and that she didn’t like using them, according to investigators. 
 
 When Barahona became pregnant, Duran accompanied her to a doctor's appointment, and he even moved in with her for a few weeks in January of 2012 before the pair split up later that month, according to the report. 
 
 Barahona admitted the relationship to city investigators, telling them she was in love with Duran and had planned to marry him, according to the report. She was fired from her $73,000 teaching job in August of 2012, a Department of Education spokesman said. 
 
 The couple split before Miguel's birth. 
 
 Building resident Nelson Jaque said he lived a floor below the woman and often saw her playing with her young son. 
 
 "I would see her often, being very protective and almost obsessed with the boy," Jaque said. 
 
 "As a matter of fact, I saw her early last week and I saw her calling for him. I told her to let him run, to let him have fun and she replied back, 'No!'" 
 
 Jaque said he told his wife about three days ago that he smelled something strange, but didn't think much about it until Monday when he was walking his dog and the smell was stronger. 
 
 "I'm just distraught for the child," Jaque said. ||||| The charges against Mr. Duran Infante made for a shocking turn in a story that, until her death, had cast Ms. Barahona as a malefactor or a punch line. Her photograph has appeared in The New York Post and The Daily News in recent years, as the tabloids chronicled a spate of prohibited, and often illegal, student-teacher relationships. 
 
 One law enforcement official, who was not authorized to discuss a continuing investigation and spoke on the condition of anonymity, said that Mr. Duran Infante had given detectives a statement, although its contents were not immediately known. 
 
 The details of the intimate relationship between the two are laid out in a 2012 memorandum by the office of the special commissioner of investigation for New York City’s schools. It was not immediately clear how closely they had been involved in each other’s lives since then. 
 
 Advertisement Continue reading the main story 
 
 Mr. Duran Infante’s family could not immediately be reached for comment. It appears that he lived in the Bronx as well as in Pennsylvania in recent years. On Tuesday, law enforcement officials and relatives of Ms. Barahona offered differing versions of his surname, with some calling him Isaac Duran and others, including the police in the news release announcing the charges, referring to him as Isaac Duran Infante. 
 
 Ms. Barahona’s half brother, Jaime Bravo, said she and Mr. Duran Infante argued over how Miguel was being raised. “It was over who gets the kid, how do we figure out what payments are done, if he’s going to pay support or not,” Mr. Bravo said. 
 
 Mr. Bravo said he believed Mr. Duran Infante had paid child support and had visitation rights. 
 
 According to Mr. Bravo and other relatives, Ms. Barahona had been moving on with her life. “She had a fall from grace and was piecing things back together,” Mr. Bravo said, adding that she was studying forensic science at John Jay College of Criminal Justice and worked there as well. 
 
 A more distant relative, who spoke on the condition of anonymity, said Ms. Barahona was quite busy given her involvement with the Coast Guard Reserve, working and studying at John Jay and raising Miguel and a daughter who was around 8. 
 
 “It’s horrible,” the relative said, adding, “whatever her transgressions, she certainly didn’t deserve a death sentence.” 
 
 “Little Miguel certainly didn’t do anything wrong,” this person said. Mr. Bravo described the boy as “your basic, happy 4-year old,” and a fan of Thomas the Tank Engine who was always reaching for his mother’s phone. 
 
 Photo 
 
 Miguel and his mother were found dead in their West 153rd Street apartment on Monday morning, the police said. Ms. Barahona, 36, was found on the living room floor with an electrical cord wrapped around her neck; Miguel was in the bathtub, the police said. 
 
 Julie Bolcer, a spokeswoman for the city’s Office of the Chief Medical Examiner, said in an email that both deaths had been ruled homicides. 
 
 Advertisement Continue reading the main story 
 
 Detectives continued on Tuesday to try to track Mr. Duran Infante’s actions in recent days. 
 
 The 2012 memo written by school district investigators offers an account of the relationship between Ms. Barahona and Mr. Duran Infante, although his name is redacted and he is identified as Student A in the version obtained by The New York Times. The report indicates that Ms. Barahona had been his teacher. 
 
 Please verify you're not a robot by clicking the box. Invalid email address. Please re-enter. You must select a newsletter to subscribe to. Sign Up Receive occasional updates and special offers for The New York Times's products and services. Thank you for subscribing. An error has occurred. Please try again later. View all New York Times newsletters. 
 
 On Halloween 2011, the memo says, Ms. Barahona and the student met to take her daughter trick-or-treating in Manhattan. Within a few weeks, Ms. Barahona and the student had begun to have sex, according to the memo. Soon, Ms. Barahona was pregnant and the student was accompanying her to doctor appointments. 
 
 The student moved in with Ms. Barahona in January 2012. They lived together for five days, in Ms. Barahona’s telling; Mr. Duran Infante said it was three weeks, according to the memo. They argued about alcohol, about a comment Mr. Duran Infante had made to Ms. Barahona’s daughter, and about whether Mr. Duran Infante would take their son to visit his relatives. 
 
 “Barahona responded that Student A was not going to take the baby anywhere and they argued,” according to the memo. 
 
 Before long, they split up, the memo says. 
 
 The relationship came to the attention of the authorities in February 2012 based on a tip from someone who had talked to Mr. Duran Infante. When investigators contacted him, he acknowledged that he had “fallen in love” and had had a sexual relationship with Ms. Barahona. He told investigators that she was pregnant. 
 
 “He embraced the idea of being a father,” the memo says.
– A man who as a teenager had an affair and subsequent child with his high school science teacher is now accused of killing them both. A building superintendent alerted to a foul smell found Felicia Barahona, 36, strangled with an electrical cord in her Manhattan apartment on Monday, while Barahona's 4-year-old son, Miguel, had been drowned in a bathtub, reports People. Miguel's father, Isaac Duran, 23, was arrested later Monday and initially denied any involvement, saying he hadn't been to Barahona's apartment since their son was born. However, police sources say Duran "owned up" to the murders after police found surveillance video showing him entering and exiting the building on several occasions, reports the New York Post. He was charged Tuesday with two counts of first-degree murder, reports the New York Times. Duran and Barahona had started a relationship in 2011, reportedly after Duran turned 18 but while Barahona was his teacher at DeWitt Clinton High School in New York City. Barahona, who was later fired, became pregnant, though her relationship with Duran ended before Miguel was born in 2012, per DNAInfo. Duran had shared custody of Miguel, relatives tell NBC News, but he was reportedly angry about how Barahona was raising the boy. His half-brother tells the Times of frequent arguments. “It was over who gets the kid, how do we figure out what payments are done, if he’s going to pay support or not." (Teachers caught having sex with students often avoid prison.)