A Yamhill reserve police officer has been arrested on charges of assaulting his girlfriend’s 4-year-old son. McMinnville police officers arrested Michael Shane Abo, 34, in Sheridan early Saturday morning after a three-day investigation.

The investigation began New Year’s Day with a medical call regarding injuries to the 4-year-old boy. The boy, who is still in critical condition, was transported to

via Life Flight.

Because Abo is a former

’s deputy, Sheriff Jack Crabtree asked the

to handle the investigation. Investigators believe that the injuries to the 4 year old were a result of physical abuse caused by Mr. Abo.

Abo was booked in the Yamhill County Correctional Facility on two counts of first-degree assault and two counts of first-degree criminal mistreatment. His bail is $1 million.

If anyone has information regarding this investigation, contact Detective Hugo Cerda of the McMinnville Police Department at 503-434-7307.

-- Casey Parks