Maine State Police investigating the murder of Romeo Parent in Lewiston said his accused killer may have believed Parent was a police informant.

Police arrested Michael McNaughton, 23, of Lewiston with the murder Friday. He is charged with killing Parent, 20, in Greene on Tuesday during a fight and dumping the body below a dam in Jug Stream.

Police discovered Parent’s body Friday.

Police said the two men were friends.

Steve McCausland, Department of Public Safety spokesman, said investigators said McNaughton thought Parent was a police informant, giving them information about a crime in the Lewiston area.

McCausland would not confirm whether Parent, who worked at a Dunkin’ Donuts, was a police informant.

McNaughton is being held at the Androscoggin County Jail in Auburn. He is due to appear in court Tuesday.