A Garrett County man charged with murdering his adoptive father told police he was mentally ill and that the television told him to do it.

Court documents say that 22-year-old Christopher Thompson called police Friday afternoon from his rural home and confessed to killing 49-year-old Andrew Clever with a baseball bat.

Police say Thompson told them he had been having thoughts about killing someone and could not talk himself out of it. He said voices on the television and in a song told him to do it.

Thompson also told police he had been prescribed medication for obsessive-compulsive disorder. His grandmother, Dorothy Clever, says he had been diagnosed with bipolar disease.

Andrew Clever was the assistant principal at Beall Elementary School. He adopted Thompson when the boy was 9, according to Dorothy Clever.