A man who stabbed to death another resident at a hostel for people with mental health issues in Bristol has pleaded guilty to manslaughter.
Robert Cox, 24, died from stab wounds after being attacked by 42-year-old Derek Hancock in Egerton Road, Bishopston, Bristol in August 2013.
Hancock pleaded guilty to manslaughter due to diminished responsibility at the hearing at Bristol Crown Court.
He was described in court as "deluded and psychotic".
Prosecuting, Richard Smith QC described how Hancock repeatedly made "unfounded and untrue" allegations that Robert Cox and other residents had made perverted sexual actions towards him.
The court heard that on the night of Mr Cox's death, Hancock phoned the police and told them he "would take the law into his own hands".
The police contacted support workers, but later the hostel's CCTV captured Hancock taking a large kitchen knife and chasing Robert Cox through the building.
Mr Cox died despite the efforts of paramedics who were called to the scene.
When Hancock was arrested, he said: "I had to do what I did as the police wouldn't protect me."
Judge Mr Justice Teare indicated a life sentence, with a minimum tariff of four years and nine months to serve, and made it clear Hancock would only be released when no longer considered a danger to the public.
A spokesman for Bristol City Council said a serious case review of the incident was nearing completion.
"The board will review recommendations and work to ensure that any learning from this sad case can be taken up by all agencies," he said.