"Ricky Williams – the dynamic but enigmatic running back whose fascinating Dolphins career was interrupted by a stunning retirement, multiple drug suspensions and a year in the Canadian Football League – retired Tuesday, informing the Baltimore Ravens that he will not return for the second and final year of his contract.

And this time, Williams appears to be stepping aside for good.

"The NFL has been an amazing page in this chapter of my life," Williams said in a statement. "I pray that all successive ventures offer me the same potential for growth, success, and most importantly, fun. As for what's next, I'm excited about all the opportunities ahead – continuing my education, running the Ricky Williams Foundation, whatever opportunities present themselves.""