She had a gaping laceration on her neck, a deep laceration on her head and a kitchen knife in her hand, according to the statement of facts written by police and provided by the Santa Clara District Attorney's Office. A medical examiner determined Navarra couldn't have caused all the wounds herself and detectives believed the scene was staged to appear as a suicide, the document said. Police spoke to Navarra's stepfather, 90-year-old Anthony Aiello, who is married to Navarra's 92-year-old mother. San Jose Police Department 
 
 Aiello told police when he was later outside his house, he heard a car honk and saw Navarra drive by waving with a second person in the passenger seat, the document said. The data showed a significant spike in her heart rate Sept. 8 at 3:20 p.m., followed by a rapid slowing, the document said. The Fitbit stopped registering heart rate data that day at 3:28 p.m. 
 
 “ ” He denied that he was present when she was killed and suggested that someone else might have been in the house. Nearby cameras captured his car at Navarra’s home for at least 21 minutes that day, between 3:12 p.m. and 3:33 p.m, but they didn’t show her car ever leaving in the direction Aiello described, police said.  A woman’s Fitbit clocked a rapid rise in her heart rate before a sudden drop-off to nothing, helping San Jose police piece together clues and charge her 90-year-old stepfather with her murder, according to court records. At his initial interview, Aiello told San Jose police that he dropped by Navarra’s home on Saturday, Sept. 8, to bring her pizza, according to court records. Aiello said his stepdaughter walked him to the door and handed him two roses when he left, the document said. "During the interview, Aiello was confronted about the information from Fitbit and the corresponding surveillance video indicating that his car was in the driveway,” the document said. During the interview, investigators also told the 90-year-old man that police found two shirts with blood splatter in his garage; he responded that he cuts himself frequently, the document said. "He was told that the deposits of blood were not localized in one area and were more consistent with splatter," the document said. Aiello appeared in court last Thursday before being remanded to custody, with no bail, authorities said, adding that he is scheduled to return to court this Thursday for plea proceedings and identification of counsel.
– Police in San Jose believe a 90-year-old man murdered his 67-year-old stepdaughter—and he might have gotten away with it if she hadn't been wearing a Fitbit. Police say they found Karen Navarra dead at her home Sept. 13 with a kitchen knife in her hand and deep wounds to her head and neck, ABC News reports. After the medical examiner concluded that she had been murdered by somebody who tried to make the death look like a suicide, investigators used surveillance footage to determine that stepfather Anthony Aiello had visited her the day of her death. He told them he had seen her later in the day—but her Fitbit revealed that her heart rate spiked, slowed, then stopped while he was at the house. During a police interview, "Aiello was confronted about the information from Fitbit and the corresponding surveillance video indicating that his car was in the driveway," police said in a statement. After police explained "the abilities of the Fitbit to record time, physical movement and heart rate data," Aiello claimed somebody else must have been in the house. He also claimed that two shirts with blood splatter found in his garage must have gotten that way after he cut himself and shook his hand, KOAT reports. Aiello, who is married to Navarra's 92-year-old mother, was arrested and charged with murder last week. (A Fitbit told a different story after this man said a fat intruder killed his wife.)