An Omaha man accused in a deadly shooting at a car show reached a plea deal in Douglas County District Court.Austin Petersen pled no contest to manslaughter in the death of 21-year-old Tristan Vincent in June 2023. In exchange for the plea, prosecutors dismissed a use of a weapon to commit a felony charge against Petersen.The shooting, which occurred near N. 90th Street and Blair High Road, also injured three people.Previous coverage: Man arrested for manslaughter in relation to deadly shooting at car show in OmahaAccording to court documents, Petersen told officers that he shot Vincent fearing for his life. He told authorities that Vincent grabbed his neck and then he took his firearm out of his right pocket.Surveillance video showed Petersen taking his firearm out prior to being attacked by Vincent, according to court documents.Petersen is scheduled to be sentenced on May 6.Click here for the latest headlines from KETV NewsWatch 7