Prosecutors and Haverty's attorneys say they will seek 50 years in prison under a plea agreement. Authorities say Knight asked a Billings casino employee to hold $120 in winnings before leaving with the men.
Police say Haverty robbed Knight of his remaining $6 and began decapitating him in a transient camp. Authorities say Cherry took part in the decapitation after returning from a gas station. Knight's body was found three weeks later.
Cherry's trial is scheduled to begin in July.
Information from: The Billings Gazette, http://www.billingsgazette.com