BROCKTON – The 22-year-old Duxbury man accused of drowning his father in 2021 was found guilty of involuntary manslaughter by a jury Thursday.

Jack Callahan was 19 when prosecutors said he shoved the head of his 57-year-old father, Scott Callahan, under water multiple times in a Duxbury pond, killing him. Jack Callahan told police that he believed his father was possessed by a spirit and he needed to be baptized and exorcised, prosecutors said.

Callahan's attorney previously called the investigation "shoddy" and said the state didn't have enough evidence beyond a reasonable doubt.

More: Prosecutor: Duxbury teen killed father while trying to 'exorcise' his demons

The trial started April 11 and the jury began deliberating about a week later. The jury twice told Judge William Sullivan they were deadlocked, but he ordered them to continue deliberating.

Callahan’s bail has been revoked and he will be held until sentencing, which is set for May 3 at 2 p.m.

Contact Hannah Morse at [email protected].