OSKALOOSA, Iowa (AP) -

A 27-year-old Oskaloosa man has been given life in prison for killing his mother's boyfriend.

The Oskaloosa Herald says Bradley Arterburn was sentenced on Monday in Mahaska County District Court for the murder of Robert "Hank" Horovitz.

Arterburn was convicted in October of first-degree murder, which carries a mandatory life sentence.

Prosecutors say Arterburn used a battle ax and a knife to kill the 58-year-old Horovitz, of Davenport, on June 19, 2011, at the home Arterburn shared with his mother.

Prosecutors said in opening trial statements that Arterburn said Horovitz reminded him of an abusive stepfather.

Arterburn had asked to be found not guilty by reason of insanity.