An elderly man impaired by dementia, who fatally stabbed his long-term neighbour after experiencing delusional thoughts about those living in his street, has been jailed for more than five years.
Derrick Brown, a 74-year-old Jamaican, attacked his neighbour, Barbadian Richard Brathwaite, 73, and his wife, Annetta, 71, with a large kitchen knife on Cromwell Road in Wembley, Middlesex, on 21st March 2024. Brown admitted manslaughter on the grounds of diminished responsibility at Southwark Crown Court in London on 9th February 2026. He had previously denied murder, and that charge was dropped after the prosecution accepted his plea.
Brown denied intentionally wounding Mrs Brathwaite but admitted to unlawful wounding and possessing a knife. Judge Anupama Thompson ordered psychiatric reports and remanded Brown in custody until sentencing.
The court heard that the neighbours, who had lived next door to one another for more than 35 years, were once amicable, but “frictions” had emerged following a dispute over a shared alleyway.
At the time of the incident, Brown was suffering from undiagnosed dementia, which had impaired his ability to form a rational judgment and exercise self-control, the court heard.
After pleading guilty to manslaughter, Brown was handed an extended sentence of five years and four months’ imprisonment and five years on licence after a hearing at Harrow Crown Court last week. Prosecutor Julian Christopher KC told the court that on the day of the incident, Mr Brathwaite was carrying out work on his car when Brown approached him and asked when he was going to “move the timber.”
It was heard that issues over an alleyway between the neighbours’ houses had caused “friction” in the past, and it is thought the comment referred to this.
Afterwards, Brown went back to his house to pick up a kitchen knife, which he had hidden under a recycling container in the weeks before, over fears that neighbours in his street might try to harm him.
The court heard that Brown then ran after his neighbour with the weapon and chased him into a garden. Mr Brathwaite’s wife, Annetta, heard shouting and ran over to her husband. She found him lying on the ground with blood on his shirt.
She ran back to call for help but was then “intercepted” by Brown, who held her against a parked car and punched her in the face.
The woman managed to push him away and run inside her house to call the police. Another neighbour had come out into the street, having heard the commotion, and asked Brown what he was shouting about.
Appearing angry, Brown responded, saying words to the effect of: “I’ve had enough, they’re not listening, they need to move their things.”
The neighbour asked what he was doing with the knife, to which Brown responded: “I’m going to kill them.”
When emergency services arrived, Mr Brathwaite was found lying in the doorway to a house, bleeding from a stab wound to his chest, which had penetrated his heart. He died at the scene. Mrs Brathwaite sustained a laceration to her top lip and a cut to the left of her forehead.
After the events, Brown travelled to the local Lloyd’s bank, which was said to be a normal part of his Thursday routine.
He was later arrested outside Wembley police station just after midday.
Brown’s wife later told the police that he had been acting “strangely” for some time and was constantly saying that Mr Brathwaite was trying to steal his house.
The elderly defendant previously pleaded guilty to the manslaughter of Mr Brathwaite, unlawful wounding of Mrs Brathwaite and having an article with a blade or point.
His plea of manslaughter was accepted on the basis that his “ability to form a rational judgment and exercise self-control was substantially impaired by the dementia and persecutory delusions from which he was suffering at the time,” Mr Christopher told the court.
Nina Grahame KC, mitigating, referred to the “robust” diagnosis of dementia given by medical professionals.
She added: “That diagnosed dementia is, we submit, the only explanation for how this elderly man of previous good character, with no history of aggression or violence, committed these acts.” The lawyer said there was a background of “grievances” between the two neighbours over a shared alleyway, which “developed as a result of the deteriorating mental health of Mr Brown.”
Ms Grahame KC added that the “tragedy” of this case was that there was no diagnosis of dementia until the court proceedings.
She referred to his career of three-and-a-half decades with TfL, adding: “He is not at base an angry or aggressive man. Throughout his life, he has been a hardworking and loving husband and friend.” Sentencing him, Judge Anupama Thompson said she was imposing an extended sentence in order to protect the public after hearing that Brown’s delusional beliefs persist to this day.
Speaking of the victim, she said: “It is clear that Mr Brathwaite was a gentle, generous, hardworking man, devoted to his family.
“His family are struggling to comprehend his loss, a loss exacerbated by the fact he was killed in front of his home of so many years.”
