An Afghan migrant admitted the "frenzied" killing of a man as well as stabbing his landlord and a teenage boy while in a "psychotic state", a court has heard.
Dawood Safi, 23, was charged with murdering Wayne Broadhurst, and attempting to murder his landlord Shahzad Farrukh, 45, and a 14-year-old boy in Midhurst Gardens, Uxbridge, on 27 October.
On the opening day of his trial at Southwark Crown Court on Monday, Safi pleaded guilty to the manslaughter of Mr Broadhurst via "diminished responsibility" because of his psychotic state.
At a hearing last month he admitted the lesser charges of grievous bodily harm with intent relating to Mr Farrukh and actual bodily harm in relation to the boy.
He will stand trial for the attempted murder of Mr Farrukh and the 14-year-old, while his manslaughter plea was "accepted" by the prosecution.
Jonathan Laidlaw KC, prosecuting, said in light of reports from four separate medical experts who said Safi was experiencing "an abnormality of mental functioning" at the time of the attacks, they will not pursue the murder charge.
"He was in a psychotic state, in other words he had lost contact with reality and he was unable to distinguish what was real and what was not," said Mr Laidlaw.
Experts found the "random, nonsensical and frenzied nature" of the killing supported Safi being "acutely unwell", he added.
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Safi, who lived with Mr Farrukh as his lodger at an address in Midhurst Gardens, was found armed with a large knife in the property's annex on 27 October.
Mr Broadhurst, who was not known to Safi, was attacked as he happened to be walking past with his dog, an earlier hearing was told.
He died at the scene after suffering multiple stab wounds, including to his neck, chest and side.
Safi also pleaded guilty to one count of possessing an offensive weapon.
He will face trial for the two counts of attempted murder on Monday afternoon.
Safi entered the UK in a lorry in 2020 before claiming asylum, which was granted in 2022, the Home Office previously confirmed.
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