Robert Colson, 35, of Bucksport was sentenced Thursday to life with no possibility of parole for 25 years.
Colson was convicted back in June for first-degree murder and other charges in the death of Mathew Miles Schoske.
Prosecutors said that Colson shot Schoske at his home in Tescott, Kansas after Schoske returned home from work.
Colson then drove to California, where he was later arrested.