A caretaker shot a 72-year-old Twin Cities man in the head with the victim's assault-style rifle and surrendered to police outside the South St. Paul home they shared, according to a murder charge filed Monday.

Jacob John Audie, 36, of Hudson, Wis., was charged in Dakota County District Court with second-degree intentional murder in connection with the shooting about 8:50 p.m. Friday at the home in the 700 block of 12th Avenue N., police said.

The victim, identified Monday by the Hennepin County Medical Examiner's Office as Michael Maurice Schille, 72, was declared dead at the scene. The Examiner's Office said Schille died from a gunshot to the head.

Audie remains jailed in lieu of $750,000 bail. His next court hearing is April 21. Court records do not list an attorney for him.

According to the criminal complaint:

Audie called police and said he fatally shot his roommate and added that the gun was on a couch.

Officers arrived to find Audie standing in the apartment building parking lot, where he was arrested.

Officers entered the residence and saw the AR-style rifle leaning against the living room couch. They found Schille sitting on a bedroom couch with a television remote in his hand.

Audie told police he has lived with Schille for the past year or two and helped care for him and clean his apartment.

The complaint did not point to a possible motive for the shooting.

Court records in Minnesota show that Audie has a criminal history that includes one conviction each for illicit drug possession and drunken driving.