Paedophile killer faces a life sentence

A killer who slit his friend’s throat after he boasted about sexually abusing a six-year-old girl is facing years behind bars. Christopher McMahon, 48, left convicted paedophile 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 concerned for his welfare….