Baltimore Ravens running back Ricky Williams has called a press conference to announcement his retirement from the NFL. Williams retired once before in 2004 as he was facing a four game suspension for drug use. He returned in 2005, but spent the 2006 season with the Toronto Argonauts of the Canadian Football League. This time it appears as if its final. "The NFL has been an amazing page in this chapter of my life," Williams said in a statement released by his alma mater, Texas,"I pray that all successive adventures offer me the same potential for growth, success and most importantly fun. I want to thank all my fans, teammates, coaches and supporters for the strength they've given me to overcome so much." Williams is one of 26 players in NFL history with over 10,000 yards rushing with 10,009 yards. He led the NFL in rushing in 2002 with 1,853 yards and was elected to his only Pro Bowl. This season with the Ravens, he was used primarily as a backup to starter Ray Rice rushing for 444 yards and two touchdowns. Williams also thanked Ravens coach John Harbaugh in his statement, "I have to thank Coach (John) Harbaugh and the Ravens organization for the opportunity they gave me this year," Williams said in the statement. "I had so much fun and really appreciated the chance to finish on such a great note."