CLEVELAND, OH - DECEMBER 13: Quarterback Johnny Manziel of the Cleveland Browns walks off the field during on December 13, 2015 game in Cleveland, Ohio. (Photo: Custom) 
 
 NEWS 8 EXCLUSIVE 
 
 DALLAS - The ex-girlfriend of NFL quarterback Johnny Manziel told police that the Heisman Trophy winner told her "shut up or I'll kill us both" after forcing her into a car, hitting her, and dragging her by the hair. 
 
 On Thursday, News 8 learned harrowing details of last week's alleged assault of Colleen Crowley by Manziel, who is currently on the Cleveland Browns roster, but is not expected to return next season. 
 
 After News 8 broke this story Thursday afternoon, Manziel denied wrongdoing in a published report. 
 
 “We've been clear about expectations for our players on and off the field,” said Sashi Brown, the Browns executive vice president of football operations, in a statement Tuesday. 
 
 “Johnny's continual involvement in incidents that run counter to those expectations undermines the hard work of his teammates and the reputation of our organization,” Browns statement reads. “His status with our team will be addressed when permitted by league rules. We will have no further comment at this time.” 
 
 "We're trying to get our son better," Manziel's father, Paul Manziel told News 8. "We're not there yet." 
 
 The NFL released a statement later Thursday saying it is aware of the police report. 
 
 #NFL statement regarding Johnny Manziel: “Our review of this incident began when it happened. We are aware of the police report.” — Mike Leslie (@MikeLeslieWFAA) February 5, 2016 
 
 Crowley has told authorities that, according to sources, she is afraid for her safety and has drafted an order of protection to be presented to a Tarrant County district court judge. 
 
 Crowley and Manziel dated for two years and lived together for four months before breaking up in December, sources said. 
 
 Sources say in her affidavit, Crowley outlines the details of an alleged assault that she said began in Manziel's hotel room in Dallas in the early morning hours of Saturday, Jan. 30. 
 
 Sources say on Friday night, Crowley and three friends started the evening off at Victor Tangos, a swanky restaurant in the Knox-Henderson neighborhood in Dallas. 
 
 Crowley and friends bar-hopped for a few hours before she met Manziel in his room at Hotel ZaZa in Uptown Dallas. 
 
 Sources say while in his hotel room, the two of them argued over another girl. Crowley told police she tried to leave the room, but that Manziel wouldn't let her. 
 
 Crowley told police Manziel "restrained" in some manner and "led" her down a back stairway to the valet area. 
 
 "I was crying and begged the valet, 'Please don't let him take me. I'm scared for my life!'" she told police. The valet reportedly told her, "I don't know what to do" and let Manziel leave with her. 
 
 Sources say Manziel then drove her about a half-mile to her car, which was parked near the Concrete Cowboy bar off Cedar Springs Road. She claims she jumped out of the car and tried to hide from Manziel, but he found her in some nearby bushes. 
 
 "He grabbed me by my hair and threw me back into the car and got back in himself," she reportedly told police. "He hit me with his open hand on my left ear for jumping out of the car. I realized immediately that I could not hear out of that ear, and I still cannot today, two days later." 
 
 Crowley then reportedly hit Manziel several times, hoping to get out of the car, but, she told police, Manziel "threw me off of him" and she hit her head on the car window. She told police he would not give her her phone. 
 
 Sources say Manziel then got on Interstate 30 and began driving to her apartment in Fort Worth. While en route, she claims, she yelled at him, "I hate you!" He allegedly replied that "he was going to drop me off, take my car and go kill himself," sources said. 
 
 She says she thought he was on drugs or maybe having a psychotic break. She told police she then began telling him she loved him. 
 
 She says at that time Manziel "started laughing" and then reportedly yelled at her to "shut up or I'll kill us both." 
 
 She says they finally made it to her Fort Worth apartment where the argument continued. 
 
 Crowley claims Manziel became angry, and smashed her phone. He then went outside and started "pacing," she told police. While she was alone, she tried to use her computer to contact her parents through Apple's FaceTime video chat system. 
 
 She said Manziel came back into the apartment, checked her computer, and realized she had tried to contact her parents. 
 
 "I was in my kitchen, so out of fear for my life, I pulled a knife out of my knife block and advanced toward him," Crowley told police. 
 
 "He ran out of the apartment," she said. When she saw him in the parking lot, she said she banged on a neighbor's door and screamed for help. Manziel fled on foot, she told police. 
 
 Dallas Police said in a statement later Thursday that "appropriate investigative follow-up" had been done and the case was closed: 
 
 The Dallas Police Department has conducted the appropriate investigative follow-up to the report forwarded to us by the Ft. Worth Police Department regarding an alleged incident involving Johnny Manziel. Investigative efforts to date have not resulted in the filing of a criminal complaint and the incident is determined to be closed. No further statement is expected at this time. 
 
 Manziel burst onto the national sports scene in 2012 while a freshman at Texas A&M University. That season, he led the Aggies to 11 wins, including a victory over top-ranked Alabama. 
 
 The win over the Crimson Tide and his dazzling play in college football’s toughest conference positioned Manziel to become the first ever freshman to win the Heisman Trophy. 
 
 He left Texas A&M after his sophomore season and entered the NFL draft. Manziel’s past legal problems and concerns over his size led NFL executives to question whether he could compete at the professional level. 
 
 Manziel wasn’t taken until the 22nd overall pick by the Cleveland Browns. Over his two seasons in the NFL, Manziel has played in 14 games for the Browns. 
 
 Copyright 2016 WFAA ||||| CLOSE Johnny Manziel's ex-girlfriend shares details of her alleged assault by the Cleveland Browns' quarterback. USA TODAY Sports 
 
 Cleveland Browns quarterback Johnny Manziel exits the field after a game vs. the New York Jets. (Photo: Ed Mulholland, USA TODAY Sports) 
 
 A woman who describes herself as the ex-girlfriend of Johnny Manziel said that Manziel struck her several times and that the Cleveland Browns quarterback appeared as if he “were on some kind of drugs” during their altercation in the Dallas area early Saturday, according to a Fort Worth police report released Thursday. 
 
 The NFL issued a statement Thursday that said, “Our review of this incident began when it happened. We are aware of the police report.” 
 
 A television station in Dallas also reported Thursday that the former Heisman Trophy winner told Colleen Crowley, “shut up or I will kill us both” after forcing her into a vehicle, hitting her and dragging her by the hair, sources told WFAA-TV/News 8. 
 
 Manziel on Thursday told TMZ Sports that he did not strike his girlfriend, saying, “It didn’t happen.” TMZ Sports also reported that Manziel denied threatening to kill himself during the altercation, adding that “I’m completely stable. I’m safe and secure.” 
 
 Manziel's agent did not respond to a phone call by USA TODAY Sports. 
 
 The Dallas Police Department said in a statement Manziel would not be charged. 
 
 "The Dallas Police Department has conducted the appropriate investigative follow-up to the report forwarded to us by the Ft. Worth Police Department regarding an alleged incident involving Johnny Manziel," the statement read. "Investigative efforts to date have not resulted in the filing of a criminal complaint and the incident is determined to be closed. No further statement is expected at this time. 
 
 Crowley and Manziel spent time earlier that evening with a group of friends at the Zaza Hotel in Dallas, according to police. After the friends dispersed for the evening, Manziel and Crowley were left alone at the hotel, the report says. 
 
 Crowley told police that is when Manziel began to become aggressive toward her. Crowley was adamant to police that Manziel was not intoxicated. She told police that Manziel struck her left ear. 
 
 The police report stated that Crowley described the incident at the hotel in vague terms. 
 
 Crowley and Manziel then proceeded toward the exit of the hotel and Manziel told her that he was going to drive her home because he did not want her to drive while intoxicated. Crowley told police that Manziel appeared as if he were “on some kind of drugs.” 
 
 Crowley said that Manziel drove her in her vehicle toward Fort Worth, where she resides. During the drive, Manziel shouted angrily and struck her several times. 
 
 The report states that Crowley “again was somewhat vague on the details of the assault.” 
 
 Crowley became irritated with further questioning by officers at her apartment. Crowley did not report an assault at her apartment, and she told officers that “she was running in and out of her apartment through the front door in an attempt to get away from Jonathan.” 
 
 She told officers that she “finally rushed out of the apartment and ran to a nearby neighbor’s door to seek help.” Manziel then fled the area on foot, the report said. 
 
 As the police investigation continued, Crowley became “increasingly uncooperative," stating that she did not want to answer any more questions or fill out a statement or make a report. 
 
 Officers notified Air One to conduct a fly over search of the area in an attempt to locate Manziel. 
 
 A Fort Worth police officer attempted to call Manziel on his cell phone but the call was not answered. Officers were unable to locate Manziel after searching the area. 
 
 Because the location of the alleged assault was in another city’s jurisdiction, in addition to Crowley’s apprehensiveness about making a report, police said an “information only” report was completed. 
 
 This was the latest incident involving Manziel, who was also pulled over by police in Ohio in October after an altercation with Crowley while driving on an interstate. He admitted he had been drinking earlier in the day. He was not arrested and not disciplined by the NFL for that incident. 
 
 WFAA-TV/News 8 also reported Thursday that, according to sources, that Crowley is afraid of her safety and has drafted an order of protection to be presented to a Tarrant County district court judge. 
 
 Manziel is not expected to return to the Browns next season. After the incident was initially reported last weekend, the Browns issued a statement indicating they are likely to part ways with Manziel in coming months. But because of the way the Browns managed their salary cap last season, with all $20 million of their space rolled into 2016, the team could not afford to take the salary cap hit it would cost to release him before the new league year opens on March 9. 
 
 “We've been clear about expectations for our players on and off the field. Johnny's continual involvement in incidents that run counter to those expectations undermines the hard work of his teammates and the reputation of our organization. His status with our team will be addressed when permitted by league rules,” Browns executive vice president Sashi Brown said last week. 
 
 
 
 That leaves the Browns, as well as the NFL, unable to truly address the issue at this time. 
 
 The functions the league put in place in 2014 to address players accused of domestic violence, with the commissioner’s exempt list serving like a paid suspension, applies only during the regular season. 
 
 The Browns on Thursday told Cleveland.com: “We're aware of the report and have nothing to add to our previous statement at this time.'' 
 
 PHOTOS: Johnny Manziel's career
– Johnny Manziel's ex-girlfriend claims the NFL quarterback forced her into a car, hit her, dragged her by the hair, and threatened to kill them both during last weekend's altercation in Dallas. Though a police report notes Colleen Crowley "was somewhat vague on the details of the assault," sources tell WFAA that the pair—who dated for two years before breaking up in December—met in Manziel's room at Hotel ZaZa on Saturday and started arguing about another woman. Crowley told police Manziel "restrained" her then "led" her down a back stairway to the valet after she tried to leave. "I was crying and begged the valet, 'Please don't let him take me. I'm scared for my life!'" she reportedly told police. She said the valet responded: "I don't know what to do." USA Today reports Manziel told her she was too buzzed to drive, so he would take her home. Sources say Manziel—who Crowley told police seemed to be "on some kind of drugs"—drove her to her car at a local bar but dragged her back to his vehicle by her hair when she tried to hide in some bushes. "He hit me with his open hand on my left ear for jumping out of the car,” Crowley reportedly said, adding she couldn't hear two days later. Crowley claimed Manziel then threatened to kill himself, later adding, "Shut up or I'll kill us both." The altercation ended at Crowley's Fort Worth apartment where she says she grabbed a knife and Manziel fled, sources say. A police report notes Crowley became "increasingly uncooperative" during an investigation, and no charges were filed. Manziel tells TMZ that he didn't hit Crowley or threaten suicide. "It didn't happen," he says. "I'm completely stable."