Kruk, Boyd and a third man, Jammie Lee, have all now been charged in connection with the case.
Two of the witnesses in the case were the victim’s friends.
Police also noticed someone had removed the license plates from one of his vans, and that another was missing.
Authorities later recovered that van more than 1,200 miles away in the town of Draper, Utah.
According to the criminal complaint, Retzer was first found dead in his home on July 22, with two stab wounds in his neck.