Gilbert is also the author of "How I Helped OJ Get Away with Murder: The Shocking Inside Story of Violence, Loyalty, Regret and Remorse." The book, published by Regnery Publishing in May, 2008, discusses Gilbert's 18-year-long relationship with O. J. Simpson, including the influence of their personal and professional relationship in the lead up to, during, and following the trials surrounding the murder of Nicole Brown Simpson. Gilbert describes how Simpson, having smoked marijuana, taken a sleeping pill, and while drinking beer, confided to him at his Brentwood home weeks after his trial what happened the night of the murders. Simpson said, "If she hadn't opened that door with a knife in her hand... she'd still be alive." This, Gilbert said, confirmed his belief that Simpson had confessed.
Mike Gilbert was also alleged to be the source of some of the memorabilia items that Simspon tried to recover from two memorabilia dealers at the Palace Station Hotel Casino in Las Vegas. Nevada, Nevada. O. J. Simpson was later convicted of all charges and sentenced to serve 9 to 33 years in a Nevada State prison.