The man who helped write O.J. Simpson's book If I Did It believes the star murdered his ex-wife and her friend.

OJ escaped prosecution over the deaths of Nicole Brown Simpson and Ron Goldman in 1994 but there has since been constant speculation that he was guilty.

Pablo Fenjves co-wrote the book - which details how the American football star would have committed the crime if he had done so - and claims that he thinks Simpson was behind the murders. He said: "[OJ] knew that I thought he was guilty."

Simpson is currently on bail after being arrested in connection with the burglary of sports memorabilia from a hotel in Las Vegas.

Fenjves said he was not shocked that the Naked Gun actor is in trouble again, saying: "It really doesn't surprise me that he thinks the rules do not apply to him."