Ten years for the paedophile killer

A former altar boy who slit a convicted paedophile’s throat after he boasted about sexually abusing a six-year-old girl has been jailed for 10 years. Christopher McMahon, 48, left drinking buddy David Potter, 50, lying face down in a pool of blood after repeatedly slashing at him in the early hours of 21 March last year. Mr Potter was found dead five days later when police forced their way into his flat in Tooting, south London, after a friend became…