By Rob Cooper PUBLISHED: 10:29 EST, 9 May 2013 | UPDATED: 13:40 EST, 9 May 2013 Murderer: Paul Groves, 34, who bludgeoned to death William 'Billy Boy' Martindale, 39, with the handle of a pickaxe A factory worker bludgeoned a self-styled Essex gangster to death using the handle of a pickaxe in a row over drugs. Paul Groves, 34, was today found guilty of murdering William 'Billy Boy' Martindale, 39, in a savage attack on his remote smallholding in High Ongar, Essex. He knocked his friend unconscious by punching him before repeatedly hitting him with the weapon. The cold-blooded killer was also found guilty of causing severe head injuries to another man, Paul Meeking, 55, in the attack.
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Paul Groves, 34, found guilty of murdering William 'Billy Boy' Martindale
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Mr Martindale had written a book about his gangster lifestyle
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But his wife Tina Joesph told the trial his claims were fanciful
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