DES MOINES (AP) — The parents of an Iowa man who drowned while in a Missouri state trooper’s custody have filed two lawsuits accusing the Missouri State Highway Patrol of negligence.

The parents of 20-year-old Brandon Ellingson allege in their lawsuit that the trooper who detained him violated his constitutional rights. They also allege that the patrol and the Morgan County, Missouri coroner conspired to hide the facts of the case and deflect blame away from Trooper Tony Piercy.

Ellingson, a Clive resident and student at Arizona State University, went into the water on May 31 as Piercy was transporting him on the Lake of the Ozarks. Ellingson had been detained on suspicion of boating while intoxicated.

A phone message left for the patrol on Saturday wasn’t immediately returned.