Authorities say a Pennsylvania man slammed his fiance's 8-year-old son onto the floor for not cleaning his room, fatally injuring him.

Allegheny County police say North Braddock resident Orlando Williams had been drinking before he tripped over a laundry basket in the boy's room and angrily tried to slam him onto the edge of his bed Sunday night. Police say he missed, and the boy fell on the floor.

The couple drove to a hospital Monday morning. Doctors called police because of the severity of the boy's injuries, including a herniated brain stem. He was on a ventilator and died Thursday.

Williams is jailed on charges including aggravated assault and endangering the welfare of a child.

Court records don't list an attorney. A phone number in his name rang unanswered Friday.