Patient found guilty of trying to kill GP by firing CROSSBOW at him

Pictured: Patient found guilty of trying to kill GP by bursting into his office and firing CROSSBOW at him leaving gaping stomach wound after blaming him for death of his 76-year-old father

  • Mark Waterfall blamed Dr Gary Griffith for death of his father four days earlier 
  • Before firing bolt, he told doctor: ‘You killed my father and I am going to kill you’
  • He has been found guilty of attempted murder at surgery in Watford last July
  • Bolt struck Dr Griffith in left side of his stomach but he miraculously survived

Mark Waterfall, 46, burst into a doctor’s consultation room in Watford, Hertfordshire, and shot him with a crossbow

This is the first picture of the crazed crossbow attacker who burst into a doctor’s consultation room and shot him with a crossbow.

Mark Waterfall carried out the attack in Watford, Hertfordshire, because he blamed Dr Gary Griffith for the death of his father four days earlier in hospital.

Before Waterfall fired the metal tipped bolt, he told the doctor: ‘You killed my father and I am going to kill you.’

Today, the 46-year-old was facing a long prison sentence after being found guilty of the attempted murder of the doctor at his surgery last July. After the verdict, police released a custody picture of him.

St Albans Crown Court heard that the bolt, which travelled at a speed of 187ft per second, struck Dr Griffith in the left side of his stomach.

Miraculously he survived because it was warm in the room and he had loosened his shirt around his waist that morning, so that it was gathered up around his midriff.

Dr Gary Griffith survived after being able to pull the arrow from out of his stomach wall

It meant the arrow had to pass through four layers of his check cotton shirt and didn’t go deep enough into his body to kill him.

The GP said he was able to pull the arrow from out of his stomach wall, telling the jury: ‘Although the wound was gaping, it hadn’t gone into the colon.’

He went on: ‘I had to pull the wound apart to check if it had gone into the bowel. I was still sitting down and I removed the bolt and put it on my desk. I pulled the wound apart to see how far it had gone in.’

As he did so, he said Mr Waterfall looked down at the floor ‘dejected’ and, realising he had failed to kill him, said: ‘I can’t even get that right.’


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Waterfall was found guilty by the jury of attempting to murder Dr Griffith on the morning of July 10 last year.

Trial judge Stephen Warner adjourned the sentencing for the preparation of reports, including a psychiatric report.

Remanding him in custody, the judge told him: ‘I am going to order a pre-sentence report and a psychiatric report to assess your dangerousness – the risk you represent to the public.

‘You have been convicted of the very serious offence of the attempted murder of a GP in his surgery and it’s inevitable you will receive a significant custodial sentence.’

The attack took place last July at Suthergrey House Medical Centre in Watford, Hertfordshire

During the three day trial, the court heard how Waterfall wrongly and irrationally blamed Dr Griffith for the death of his father, 76-year-old Terrence Waterfall.

Five days before the crossbow attack, Terrence Waterfall had gone to see the Dr Griffith at the Suthergrey House Medical Centre, complaining of breathlessness.

The doctor found he had fluid on his lung and arranged for him to be admitted to Watford General Hospital that same day.

The plan was for the fluid to be drained, but the court heard medics at the hospital found the father had a cancer on his lung and the procedure could not be done.

The following day Mr Waterfall Snr died at the hospital.

In the days that followed, the son – who has a history of mental health issues including an eating disorder and depression – became convinced that the doctor was responsible for this father’s death.

Waterfall, who was also a patient at the surgery, blamed the treatment the doctor had given to his father and to himself.

On the morning of July 10 last year, Waterfall left his home in his silver Hyundai car and drove to a nearby Wetherspoons pub for breakfast.

On entering the surgery that morning, he had crossbow hidden in two plastic carrier bags

Then he drove to the surgery where Dr Griffith has worked for more than 20 years. In the car was a powerful crossbow Waterfall had brought two weeks earlier.

On entering the surgery that morning with the crossbow hidden in two plastic carrier bags he could seen from a screen which consultation room the GP was working in.

He then sat in the waiting area, positioning himself so that he could look down a corridor and see when a patient left room nine and the doctor would be on his own.

At around 11am, Dr Griffith was sitting at his desk in a swivel chair writing up a patient’s notes when the door to the room suddenly opened and Waterfall walked.

‘He stepped into the room and was pointing something at me,’ the doctor told the court.

He said he couldn’t tell immediately what it was because it was wrapped in two plastic carrier bags.

But he said when Mr Waterfall pulled away the bags he could see ‘It was a loaded crossbow.’

Dr Griffith said he had recognised the defendant as a patient as soon as he came into the room. ‘He had been my patient for 10 years years. I recognised him immediately. He just seemed furious,’ he said.

Mr Waterfall, he said, then told him: ‘You killed my father and I am going to kill you.’

The GP went on: ‘His fist was clenched, it was like his whole body was clenched.’

The doctor said from a distance of about 5ft, Mr Waterfall fired the bolt at him which entered the left side of his abdomen while he was still sitting in his swivel chair.

The jury heard Dr Griffith was saved from serious injury that day because it had been very hot and he had loosened his shirt by pulling it up from under the waistband of his trousers so that it was gathered in folds around his midriff area.

The court was told after firing the bolt and realising he hadn’t killed the doctor, Mr Waterfall, of South Oxhey, Watford, dropped the crossbow on the floor and left the consultation room.

Dr Griffith, having removed the bolt from the left side of his abdomen, followed him outside the building to the car park and tried to stop him from getting into his car by talking to him.

‘I tried to persuade him to go to the police station round the corner. I said I will come with you. I wasn’t sure if he had anything else on him,’ he said.

In the car park he said the defendant had told him he had ‘murdered’ his father, adding: ‘You have been sending me to a loony bin for 30 years.’

The doctor said when Mr Waterfall got into his car he took photos on his mobile phone of the vehicle’s number plate before going back into the surgery where he called the police.

He said a woman colleague ‘dressed the wound.’

The prosecution said how, in the days leading up to the attack on the doctor, the defendant had ‘developed a festering hatred’ for him based on what his perceived as the mistreatment of himself and his father.

The court heard Mr Waterfall had in the past experienced mental health issues, including an eating disorder and depression.

After the defendant’s arrest, said the prosecutor, police officers discovered he had documented his anger at the treatment given to his father and himself in a number of video and audio recordings he had made.

A USB stick that was strapped to his toe on his arrest was also found to contain information ‘files’ in which he expressed his anger.

The court was told an expert who examined the crossbow tested it and found it could send an arrow through the air at a speed of 187ft per second and was capable of causing a fatal injury.

Giving evidence, Waterfall told his barrister Charles Langley he had not meant to harm or kill the doctor.

He claimed he took the crossbow with him to the surgery that morning because he wanted to confront Dr Griffith and get answers ‘about my medical health and my father’s medical health. I was going to try and scare Dr Griffith,’ he told the jury.

‘I aimed down and away so I wasn’t going to hit his trunk or face. I hit him where I aimed to hit him,’ he said, telling the court he hadn’t told the doctor he was going to kill him.

Waterfall, at the start of the trial, admitted a charge of wounding Dr Griffith with intent. He will be sentenced next month.

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