The 'psycho' train passenger who knifed to death a man on a commuter train in front of his teenage son was today found guilty of his murder.
Darren Pencille, 36, stabbed 51-year-old Lee Pomeroy 18 times in a 'savage and unrelenting' onslaught on board a Guildford to London Waterloo train on January 4.
Pencille is a career criminal who bragged about his convictions for carrying guns and knives and fighting rivals 'to the f***ing death' for his South London gang, MailOnline can reveal today.
The cannabis-addict was a lieutenant in the South Man Syndicate [SMS] crew in the capital whose members have terrorised the areas of Tooting, Streatham and Thornton Heath since the 1990s.
Mr Pomeroy's widow Svetlana today told the Old Bailey that her husband's murder was a 'senseless loss of life', made worse because it was in front of their son who she said had lost 'defender, guide and mentor'.
Pencille's extraordinary criminal past of more than dozen convictions - including slicing a man's neck in a row over a Rizla cigarette paper - was revealed in a gang video posted on YouTube where he called on an enemy to meet and fight him.
One fellow gangmember who knew him well told MailOnline: 'He smoked weed constantly and was a complete psycho. I feel so sorry for the man he killed and his son'.
Today it can be reported for the first time he was seen by a psychiatrist 24 hours before murdering Mr Pommeroy but was certified as 'no risk to himself or others' - months after he told a hostel worker: 'I'm going to kill you you c***'.
Pencille was diagnosed with paranoid schizophrenia in 2003 but he refused to take medication - and instead treated himself by smoking super-strong cannabis each day.