Charles Barron Jr. initially appeared as though he took his own life in his jail cell. Video footage showed otherwise, court records reveal, and led police on Sunday to arrest his cellmate at the new Marion County Jail.

Barron was pronounced dead Sunday evening at the Adult Detention Center after a deputy found him unresponsive at about 10:15 p.m. in his cell. Police in a preliminary probable cause affidavit said it appeared Barron hanged himself, until video from the control room showed he was strangled with a bedsheet, then had his pants wrapped around his neck and his body propped up.

The video helped lead police to arrest Barron’s cellmate, D’Angelo Smith, in his death. Smith, 25, was booked into jail the day before on preliminary charges of arson and criminal mischief in connection with a dumpster fire that occurred on the west side of Indianapolis. Barron was booked on June 12 on a misdemeanor charge of unauthorized entry of a motor vehicle.

Detectives in the affidavit said the video showed Barron moments before his death asleep on his mat. They said Smith is seen placing white socks over his hands like gloves, wrapping a white bedsheet around his hands and checking “multiple times” for anyone nearby. Police said he then jumped on Barron’s back and wrapped the sheet around Barron’s neck. Barron is seen waking up and struggling with Smith until he stopped moving, police said.

Police in the affidavit said Smith took off Barron’s pants and cleaned up the area by wiping nearby surfaces. He then placed Barron’s pants and a blanket around his neck to make it appear like the 36-year-old hanged himself.

A deputy found an unresponsive Barron and flagged a nurse and another deputy to attempt CPR. The deputy told detectives that’s when Smith came out of the cell and “took off” down the hall. Two deputies chased after him and placed him into a holding cell. Police took him to another floor after determining Barron did not die by suicide, the affidavit said.

During interviews with detectives, police said Smith told them he strangled Barron and said he tried to clean up so deputies would not kill him.

The Sheriff’s Office declined to comment about the killing, citing an ongoing investigation by its office, Indianapolis police, the coroner’s office and Marion County Forensic Services Agency.

The Marion County Public Defender Agency, whose office represents both Barron and Smith, also declined to comment about the case.

Barron’s killing is the first homicide inside Marion County’s new Adult Detention Center, which is part of the Community Justice Campus on the city’s Twin Aire neighborhood on the east side. In January, jail staff began to transfer the facility’s population to the new building, located on Justice Way.