A judge has ordered a northern Oklahoma man accused of nearly beheading a 19-year-old friend to undergo a psychological and physical evaluation.

Twenty-one-year-old Isaiah Marin is charged with first-degree murder in the Oct. 29 attack that killed Jacob Andrew Crockett in Stillwater, about 65 miles northeast of Oklahoma City. A police affidavit says Crockett had multiple stab wounds and his head was "mostly severed" from his body.

Prosecutors are seeking the death penalty.

Marin's attorneys last week filed an application requesting the competency exam, saying he is not capable of standing trial.

Payne County District Judge Katherine Thomas reviewed the application Monday and ordered the tests.