Every once in a while there is a crime that is so genius in its simplicity like this true story of the Stardust Hotel and Casino robbery. A quarter of a century ago—on an autumn morning—casino employee Bill Brennan walked out of the front door with a bag of nearly half a million dollars—and has never been seen since. Here is the true story of the unsolved Nevada casino heist that continues to stump people today.

On 22 September 1992, one of the most brazen and effortless casino heists occurred. Cashier Bill Brennan took his cashier bank and walked out the door with more than $500,000 in stolen cash and casino chips in a bag-and vanished.

Brennan worked at the Stardust Hotel and Casino that was located at 3000 Las Vegas Boulevard South and was owned and operated by the Boyd Gaming Corporation.

The then-34-year-old Brennan was described by his former boss Scott Schettler as a humble and pleasant loner with a cat who was an honest and accurate ticket writer, so Schetller promoted him to cashier.

Brennan walked out of the front door carrying a bag of $500,000 (although some accounts say $300,000) in cash and casino chips which were stolen from the race and sportsbook.

After the crime, police searched Brennan's apartment but neither he nor his cat were there. Officers did find some books and other literature detailing how to change one's identity and move overseas.

To this day, Brennan remains on the FBI's Most Wanted List and has been featured on America's Most Wanted. He has never been caught.

Neither Brennan nor the money has ever been seen again, either in Las Vegas or his native Pennsylvania. Even stranger is that there is no visual evidence of Brennan's departure. This is quite odd given the plethora of video surveillance cameras throughout the casino that was closely monitored 24 hours per day.

There are several theories about Brennan. One is that he started hanging out with an unidentified heavy gambler who has also never been seen since the heist. Perhaps this unidentified man was Brennan's accomplice, and perhaps the accomplice killed Brennan after the robbery and hid his body. Another theory is that Brennan was connected with the mob. Still others claim that, perhaps, Brennan changed his appearance and identity and continues to live and work in Las Vegas. Finally, some speculate that Brennan was able to escape to Mexico or Canada and change his identity.

Following the caper, area sports books implemented new security controls to ensure a repeat never occurs, and, in fact, no sports book has been robbed internally since.

The Stardust was eventually imploded on 13 March 2007 at 2:33 a.m.

Regardless of what happened to Brennan, this unsolved Nevada casino heist remains one of the most interesting crimes in Las Vegas history.