A 22-year-old Massachusetts man who repeatedly dunked his fathers head underwater in what he described to authorities as a baptism-style exorcism was found guilty Thursday of involuntary manslaughter in his death.

Jack Callahan had pleaded not guilty to first-degree murder in the 2021 drowning death of Scott Callahan, 57, in a pond in Duxbury, about 35 miles southeast of Boston. After an eight-day trial, the jury twice told the judge it was deadlocked, The Patriot Ledger reported , but it ultimately reached a verdict on the lesser charge.

On the night of June 27, 2021, Jack Callahan picked up his father at a Boston bar after Scott Callahan, who had a history of substance abuse, checked himself out of an alcohol treatment facility.