The Minot Police Department arrested a Minot woman on Monday and charged her with killing her boyfriend through poisoning.

Ina Thea Kenoyer, 47, Minot, is charged with Class AA felony murder and is being held at the Ward County Jail.

Steven Edward Riley Jr., 51, Minot, died Sept. 5 at a Bismarck hospital. Riley was initially brought to Trinity Hospital in Minot but was transferred to a Bismarck hospital where he later died. Autopsy results determined that the cause of death was poisoning.

Police believe Kenoyer, Riley’s girlfriend, had financial motives to murder Riley.

“This case was extremely complex,” Investigations Commander Capt. Dale Plessas said. “Thank you to everyone who provided us with information that helped our investigators piece this together.”

The investigation is ongoing.