A Louisiana appeals court overturned Gasser's conviction based on a U.S. Supreme Court ruling regarding non-unanimous juries. The high court ruled in April that jury verdicts in serious crimes should be unanimous.
Louisiana voters amended the state constitution in 2018 to require unanimous juries.
Gasser was charged with murder after prosecutors say he chased McKnight across the Crescent City Connection in a fit of road rage, then shot McKnight at the intersection of Behrman Highway and Holmes Boulevard in Terrytown. the defense argues Gasser was being threatened by McKnight and lawfully defended himself.
The jury voted 10-2 to convict Gasser of the lesser charge of manslaughter. A judge sentenced Gasser to 30 years in prison.