Zakaria Bulhan locked up in Broadmoor Hospital indefinitely after Russell Square knife attacks

The 19-year-old who suffers from paranoid schizophrenia killed retired teacher Darlene Horton with a large kitchen knife on August 3 2016 when suffering from a psychotic break. 

See related: Teenager admits killing American tourist and wounding five others in Russell Square knife attack

The teenager also stabbed five other people, Bernard Hepplewhite, 65, Lillie Sellentin, 23, Martin Hoenish, 59, David Imber, 40, and Yovel Lewkowski, 18, who suffered non-life threatening injuries. 

He believed he was hearing the voice of the devil and "erratically" moved through crowds of people coming out from shows in the West End, stabbing victims along the way. 

Delivering the sentence, Mr Justice Spencer said: "These were crimes which caused enormous public concern because, from the timing, it was feared initially they might be the work of a terrorist fanatic. As it turned out they were not. 

"You were suffering from severe mental illness - paranoid schizophrenia - which substantially diminished your responsibility for the killing."

He said that Mrs Horton's death was a "tragic loss of life". 

Bulhan was born in Norway to parents of Somali origin and emigrated to the UK in 2003.

He was living in Tooting with his mother, step father and two siblings at the time of the attack. 

Originally charged with one count of murder, five counts of attempted murder and five counts of wounding with intent, the 19-year-old admitted one count of manslaughter with diminished responsibility and five counts of wounding with intent. 

The court accepted this decision due to Bulhan's mental state at the time. 

The night of August 3:

CCTV shows Bulhan entering Russell Square from the south at Montaigne Street at  10.22pm.

The defendent was seen "moving in an erratic fashion" on the pavement armed with a large kitchen knife, according to prosecutors, and "without warning or provocation" he stabbed six people in quick succession.

Darlene Horton, who was visiting London with her husband Richard Wagner, was stabbed in the back.

The knife penetrated her left lung and heart and she died at the scene.

Darlene, 64

The court heard that Bulhan was experiencing an "acute" episode of schizophrenia at the time of the attacks.

According to psychiatrists, his mother had met and married a Somalian man in 2015, and Bulhan lived with the pair in Tooting.

The Merton College student left school at 16 and retook his GCSEs at college, but dropped out in April 2016 as his mental state deteriorated.

Bulhan's mother and younger brother had gone to Holland to visit family on July 26, but there were concerns about his behaviour and on Monday, August 1, his father went to the house in Tooting to collect him.

His father took him to the mosque in Camberwell and then to his own house in Wood Green where he spent the night.

They had gone to the mosque on August 3 to pray, but his father had to stop him from leaving.

A short while later, Bulhan managed to escape, and was seen on CCTV at 6pm on Mile End Road.

Scotland Yard was initally concerned that the stabbings were related to terrorism but found no evidence to support this theory.

Mr Hoenish, a retired fireman from Las Vegas, described the attack on Facebook as a "very unreal experience" and he was "still very saddened about the woman who was killed".

Ms Lewkowski said on the social media site that she did not know whether to call it "luck or fate" that she survived.

Richard Wagner, Mrs Horton's widower, said in a statement: "Losing Darlene, my wife and best friend, under these circumstances is as bad as you might imagine it to be, if not worse.

"As bad as I feel for my loss, I feel worse for the loss experienced by my two daughters." 

Their daughter, Shannon Wagner, said London had a "special place" in the hearts of the family, but the city was now "tarnished".

She said Bulhan had "lost the right to be in society".

The court heard Lillie Sellentin said she had been on the east side of the square when she saw a man "smiling and skipping" along the road.

She saw Bulhan "skip" towards an older couple - Bernard Hepplewhite and his friend Kathryn Mombourquette - and he appeared to punch him in the stomach.

She said that Mr Hepplewhite had shouted in pain before Bulhan "skipped" on while showing "no signs of anger".

Bulhan then attacked Ms Sellentin, who thought initially, as did Mr Hepplewhite, that she had been punched.

She said that somebody had shouted "he's got a knife" and it was then that both victims looked down and realised they had been stabbed.

Both victims travelled to hospital together in a taxi.

The court heard that Richard Wagner, husband of Darlene Horton, "became aware of a commotion" when suddenly a man rushed past them and he heard his wife say "ouch".

Prosecutor Mark Heyeood said: "Mr Wagner did not know what had happened but his wife's reaction seemed muted and gave no clue as to the seriousness of what had in fact happened.

"Mr Wagner watched the man as he ran on past them in a haphazard manner, swerving and loping towards members of the public. It was only then that he saw that the man was holding a knife.

"Mr Wagner shouted to warn others that 'this guy is trying to stab people'."

Bulhan then attacked Martin Hoendish, who was stabbed in the side, followed by David Imber who was stabbed in the chest.

Yovel Lewkowski was stabbed in the arm and was found "screaming hysterically" on the ground by a witness.

Within six minutes of the alarm being raised, officers arrived and detained Bulhan.