FRISCO -- Police want to know what led up to the death of 17-year-old Tyrell Conway.
The popular Frisco Liberty High School student-athlete was involved in a mysterious accident at Stonebriar Centre Mall.
Conway was driven in a private car to a Frisco hospital, delaying the police department's investigation into what happened. Officers say he somehow left a moving car. But investigators say no one has come forward to tell them what happened.
Three days later, he was dead as a result of his injuries.
Tyrell Conway's friends called him an outgoing, kind, and humorous student at Liberty High. He was a running back on the varsity football team and ran track.
"As details kept emerging and emerging, we became surprised and shocked at how Tyrell may have died,” said Parker Collins, a teammate and friend.
Police investigators say details are sketchy. They didn't know about the incident until they received a call from Centennial Medical Center. By the time officers went back to the mall, it was closed and there were no witnesses.
“We've received some tips and some leads,” said police spokesman Sgt. Brad Merritt. “So we're trying to develop information. So we're asking anyone who has info to come forward and contact the police department."
Conway was conscious after the incident. He told police he didn't remember what happened. But three days later, he went into a coma. He was taken to Parkland Hospital, where he died.
"It's sad being kept in the dark, but police are investigating it, and we hope something will come about very soon,” Collins said.
Police are hoping witnesses or people who have information about the incident will contact them.
“We're talking about the death of a student, somebody's child,” Merritt said. “So we'd like to get to the bottom of that and figure out what happened, so we can give the family some closure and bring people to justice, if that needs to be the case."
Tyrell Conway's funeral will be held Friday at a Plano church.