David Dallimore (Image: South Wales Police)
Last Updated: 3 minutes ago
A 37-year-old father-of-three who armed himself with a kitchen knife and terrorised a stranger in a jealousy-fuelled outburst has been sentenced to 18 months in prison.
David Nigel Dallimore, of St Leger Crescent, St Thomas, Swansea, was brought before Swansea Crown Court after admitting possession of an offensive weapon, making threats with a bladed article in a private place, harassment, and battery. A kidnapping charge was not proceeded with after the prosecution offered no evidence on that count.
Sentencing
Judge Huw Rees described Dallimore’s actions as “inexplicable and bizarre” and said what had unfolded at the victim’s home “borders on a ménage of some kind.” He stressed that the courts were required to treat seriously offences involving “the culture of threatening with knives” as a matter of public policy.
The judge told Dallimore he had “devastated the family unit” but expressed hope that matters could eventually be put behind them. With a one-quarter discount applied for his guilty pleas, Dallimore was sentenced to 18 months in prison. He will serve up to half in custody before being released on licence to complete the remainder in the community.
The night it began
The court heard that on March 13 this year, Dallimore was invited to the home of a woman he knew called Sian Lewis by a mutual friend. Prosecutor Craig Jones explained that the pair spent the evening drinking and socialising before having sex. The following morning Dallimore gave Ms Lewis his phone number as he left.
Escalation
What followed was a rapid deterioration in Dallimore’s behaviour. He bombarded Ms Lewis with unwanted messages and calls before arriving at her home in the Manselton area of Swansea late on the evening of March 13, demanding to know who the males inside her property were.
The court was told Dallimore was “clearly under the influence of either alcohol or controlled substances” and refused to leave when asked, wedging his foot in the door to prevent it from closing. Ms Lewis eventually managed to push the door shut and the defendant left.
The knife attack
Dallimore returned in the early hours of the following morning. When the front door was opened he rushed inside and pulled a chef-type knife from the waistband of his trousers. He began waving the blade at a man in the property, David Evan Turner.
The prosecution outlined how Dallimore attempted to force Mr Turner to place his hands flat on the kitchen worktop so he could stab them, shouting “I’m going to kill you. I’m going to slash your face” and “Where’s the stuff?”. He slapped Mr Turner across the face and claimed he had served a prison sentence for murder, that accomplices were waiting outside, and that he had access to firearms.
Dallimore then concealed the knife behind the fridge and forced Mr Turner out of the property and into a works van parked outside, compelling his captive to drive them both away from the scene.
Armed police response
Officers had already been alerted and firearms units were deployed to the area. The van was located and stopped, with both occupants initially arrested. When police attended the property, two knives were recovered from behind the fridge and stab-type marks were noted on the kitchen worktop.
Previous offending
Dallimore has a history of convictions including for possession of offensive weapons, public disorder, battery, and motoring offences. In 2020 he was jailed for perverting the course of justice after crashing his car and then falsely blaming a cousin of his partner for taking the vehicle without consent – an accusation that led to the innocent man being arrested and placed at risk of recall to prison. His most recent conviction, from June 2025, was for dangerous driving, for which he received a community order.
Defence arguments
Dean Pulling, representing Dallimore, acknowledged the conduct was “brazen” and would carry consequences beyond the courtroom. He characterised the episode as a “grotesque mid-life crisis,” describing an “ill-judged affair” followed by a loss of control driven by “misplaced jealousy when it became apparent that the sexual exploits of the previous night would not be repeated.”
The barrister told the court that Dallimore has three children with his wife, with a fourth on the way, along with both parties having one child each from previous relationships. He said that despite the events, Dallimore hopes to return to the family and “make amends,” and hopes his wife is prepared to “give him a second chance.”
