Riley was given a tryout with the Washington Capitals during their inaugural season and actually played in one game, but he spent most of his time in the minors, primarily with the Dayton Gems. It was during this time that he played under future Capitals' coach Tom McVie. He would eventually be signed as a free agent by the Capitals during the 1976–77 NHL season and would play for the Capitals in parts of the next three seasons.
Riley was player-coach and captain of the St. John's Caps located in Newfoundland for a number of years during the late 1980s.
After retiring from professional play, Riley moved into coaching. He was the Head Coach, General Manager and Director Of Player Personnel of the Miramichi Timberwolves of the Maritime Junior A Hockey League. He also served as Head Coach of the Moncton Wildcats during the 1996–97 season, finishing with a 16–52–2.
- Bill Riley career statistics at The Internet Hockey Database
- Bill Riley biography at Legends of Hockey
- Moncton Wildcats
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