Mother of teen who drowned his dad in 'exorcism' style killing called 911 when he came home in soaking wet clothes claiming his father was 'missing'

The mother of a teenager accused of drowning his alcoholic dad as part of an 'exorcism' called 911 when he came home and claimed his father was missing.

Jack Callahan, 22, is currently on trial for the murder of his father Scott, 57, who was found by police floating in a pond outside Duxbury, around 30 miles outside of Boston, in June 2021.

He was 19 when his mother Wendy called police saying her son was having a mental health episode and that her ex-husband was missing.

Police then called an ambulance after finding Callahan 'worked up and distraught', hyperventilating and passing out. 

He told them his father hit him, and he did not know where he was: 'He's missing. I don't know what happened. I blacked out.'

Jack Callahan, 22, has gone on trial for the murder of his father Scott during an 'exorcism'

Police found Scott Callahan (pictured with a unnamed woman) dead in a pond outside Duxbury, Massachusetts in July 2021  

Jack Callahan, 21, cried when he first pleaded not guilty at Plymouth District Court in 2021

Callahan told police he had been bringing his father home from a bar when they stopped next to Island Creek Pond where his father began attacking him

Callahan eventually directed police to Crooker Memorial Park where officers found Scott in Island Creek Pond.

He told cops his banker father was possessed by a demon called 'Dirty Dan' who he thought could be destroyed through baptism.

He was bringing his father home from a Boston bar when his mother called to say she would not have her ex-husband in their house, and the young man asked their cab driver to pull over next to the pond.

He grabbed his father and repeatedly plunged his head under the water, telling cops: 'I left him there to decide, you can come to heaven with me or hell. I think he chose hell.'

Scott Callahan's obituary reported that he was the Senior Vice President of Texas Capital Bank, and had an 'extensive career in finance'.

He had been receiving treatment for alcoholism at a center in Hopkinton before he checked himself out and headed for the bar in Boston.

The teenager called an Uber to bring him back to the $1.5 million home in Duxbury and said his father began to attack him when he asked the driver to pull over at around midnight.

Wendy Callahan with her children Jack, Will and Charlie a year before Scott's death

Scott Callahan's obituary reported that he was the Senior Vice President of Texas Capital Bank, and had an 'extensive career in finance'

The family lived in this $1.5 million five-bedroom house outside Duxbury 

'He indicated that the victim had been punching him in the face,' Plymouth Assistant District Attorney Shanan Buckingham said at Callahan's 2021 arraignment.

'He went on to state that in this incident at the pond, he believed he was baptizing his father.

'He described that he was holding his father in the pond on his back like a baby, that he continually dunked the father's head in the water about four to eight times, that when the father started to cough and choke, he would lift his head up.

'And then when the father started to fight and strike him, he would push the head back into the water.

'He did so until his father was no longer struggling and floating.'

'The mother indicated that the defendant had not exhibited this behavior before and that he had no history of mental illness,' Buckingham said. 

Authorities said Callahan went to a bar in Boston Sunday night to pick up his father, Scott Callahan, 57, who was not supposed to be drinking 

The public gallery was packed as the trial got underway on Friday

Officers attempted CPR on the Colorado State University graduate before he was taken to Plymouth's Beth Israel Deaconess Hospital where he was pronounced dead.

The teen was arrested the following day and cried in court as he pleaded not guilty at the first hearing in 2021.

Callahan's attorney Kevin Reddington asked the judge to send the teen to Bridgewater State Hospital for a mental health evaluation, warning that he was a danger to himself.

'He's a very nice young man,' Reddington said, 'He comes from a wonderful family.

'My client had a concern for his father, knowing that he would be drinking and knowing that he shouldn't be.

'He was going to try to take him back where he should be.'

His mother told the court that he had been living with a brother in Colorado and had to leave his job in the logging industry after injuring his back before returning to Duxbury to live with his mother.

Callahan has pleaded not guilty to murder and the trial is expected to last for 10 days.