He left his positions with the Mustangs to become head coach of the newest iteration of the Peoria Rivermen in the Southern Professional Hockey League.
•
He then went to Europe to play in the Swiss National League A for the rest of his career, save for a single season with the Peoria Rivermen of the AHL in 2008, principally for Ambri-Biotta, for whom he finished in the top three in the league in either goals or points his four seasons with the team.
Peoria, Illinois | Peoria | Peoria Rivermen | Peoria Rivermen (AHL) | Chicago, Peoria and St. Louis Railroad | Peoria Notre Dame High School | Woodruff High School (Peoria, Illinois) | Spirit of Peoria | Peoria (tribe) | Peoria tribe | Peoria Symphony Orchestra | Peoria Sports Complex | Peoria Rivermen (SPHL) | Peoria Javelinas | Peoria Heights High School | List of places named Peoria |
On June 16, 2005, he was named the head coach of the Peoria Rivermen for the 2005–06 AHL season, replacing Don Granato who was receiving treatment for cancer.
On March 2, 2012, the Coyotes loaned O'Sullivan to the Peoria Rivermen of the AHL in exchange for Brett Sterling.