Jurors hear different versions of why Ronald Gasser shot former NFL player Joe McKnight

NEW ORLEANS, LA (WVUE) - On the first day of testimony in the trial of a man accused of killing former NFL player Joe McKnight, the jury heard 911 tapes and watched graphic cell phone video.

Ronald Gasser, 56, is charged with second-degree murder in the shooting death of former New York Jets player Joe McKnight. Prosecutors say Gasser shot and killed McKnight as McKnight stood at Gasser's passenger-side window after a wild back-and-forth car chase fueled by road rage.

A forensic toxicologist testified that McKnight had marijuana and oxycodone in his system when he was shot.

The defense attorney told the jury that Gasser is not a murderer but a Marine veteran who was only acting in self-defense. The defense attorney said McKnight lunged in, and his client felt scared and fired three shots at McKnight.

The jury saw dramatic cell phone video that showed a responding officer and two witnesses rendering CPR to McKnight on the scene before he died. The jury was also shown hours of an eight-and-a-half video of Gasser being interviewed by investigators.

The trial is expected to last about two weeks. If Gasser is convicted of second-degree murder, he faces the rest of his life in prison.

The trial continues Saturday at 9 a.m.