LOS ANGELES -- A memorabilia dealer who profited from O.J. Simpson for many years contends in a new book that Simpson, while high on marijuana, confessed to killing his ex-wife.

In the book, Mike Gilbert says Simpson had smoked pot, taken a sleeping pill and was drinking beer when he confided at his Brentwood home weeks after his trial. According to Gilbert, Simpson said he went to his ex-wife's condominium, but did not bring a knife with him.

The book says that Simpson, in a soft mumble, told Gilbert: "If she hadn't opened that door with a knife in her hand ... she'd still be alive."

Gilbert's book, "How I Helped O.J. Get Away With Murder: The Shocking Inside Story of Violence, Loyalty, Regret and Remorse" is due in stores Monday. It was released to The Associated Press in advance.