OJ Simpson is said to have paid gangsters from one of history’s most maniacal mafia mobs to slaughter his ex-wife Nicole Brown. The NFL hero-turned-actor, who died aged 76 on April 10 after a prostate cancer fight, was shockingly acquitted of the 1994 double-murder of Nicole, 35, and her friend Ron Goldman, 25, at her home after his blockbuster 11-month ‘Trial of the Century’, but was found liable for their deaths in a civil case and ordered to pay $33.5 million in compensation to her and Ron’s families. A key police witness in Simpson’s criminal case has now said Simpson was at the scene of N…