Gasser, 55, was originally arrested December 5 on a manslaughter charge, four days after the shooting.
The man accused of killing former USC running back Joe McKnight has been indicted.
Detectives determined that McKnight and Gasser were driving erratically on a bridge or before they reached it.
If Gasser is convicted, he faces a life sentence without the possibility of parole, probation or suspended sentence.
Judge June Darensburg from the 24th Judicial District Court increased Gasser's bond to $750,000 following his indictment.
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Prosecutors can seek the death penalty but that decision will ultimately be in the hands of the USA attorney general. Santiago served in the National Guard, including a tour in Iraq, and was discharged for unsatisfactory performance.
McKnight, who was at a passenger's window of Gasser's vehicle, was shot in the right shoulder, the right chest and the hand. When McKnight finally stopped, he got out of his auto and approached Gasser's vehicle when Gasser allegedly shot him.
On Dec. 6 the Jefferson-Parish Country Sheriff said the lesser charge made the most sense at that time. He was arrested on manslaughter charges a few days later.
McKnight joined the Roughriders in October of the 2016 season and had a standout start, rushing for 150 yards in three quarters of play.
"I woke up this morning hoping maybe I dreamed it", Jones said.
Though McKnight, 28, spent his professional years with the New York Jets and Kansas City Chiefs, he grew up playing football in River Ridge, a 30-minute drive from Terrytown. "It's just a awful loss".