A man who is suspected of shooting dead a police sergeant at while being detained was caught with an air gun at school, a former pupil has claimed.
Louis De Zoysa, 23, was arrested for allegedly carrying ammunition and taken to the Croydon Custody Centre in south London in the early hours of Friday, September 25.
Shortly afterwards, at around 2am, Sergeant Matt Ratana, 54, was fatally shot.
De Zoysa was also said to surf the dark web as a teen.
At the time he attended the Roman Catholic all-boys John Fisher School in Purley, South London, and a former classmate who is now 23, told The Daily Mirror: “I was told he got in trouble for bringing some kind of air gun into school."
He added: “That was in 2015 and it was the first time I had heard of it.
"He was calculated in that way and he had a kind of anti-establishment attitude.
"He was one of the people at school who wasn’t afraid to break the rules.”
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The former pupil said De Zoysa was “a bit awkward, a bit weird” and was among the brightest pupils in the year.
De Zoysa reportedly went on to study mechanical engineering at University College London, but dropped out after a year.
He remains in a critical condition in hospital after appearing to shoot himself during the incident.
A second suspect remains in custody at a south London police station on suspicion of supplying a firearm.
He was arrested on Sunday, September 27, in Norwich, Norfolk.
Police are searching De Zoysa’s family home in Norbury, south west London, and an address in Banstead, Surrey.
The operation, which includes more than 30 acres of land, is expected to take days.
Deputy Assistant Commissioner Stuart Cundy, responsible for the investigation, said: “The murder of Sgt Ratana sent shockwaves through the Met.
"His colleagues are determined to find justice for him and his family.”
Police near Wellington, in the officer’s native New Zealand, performed a traditional Maori Haka dance in tribute on Tuesday.
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