 In 1998–99, Cassidy was promoted to head coach of the Indianapolis Ice of the IHL, the club finished the year at 33–37–12 for 78 points and qualified for the playoffs.In the first round, they played the heavily favoured Cincinnati Cyclones in a best of three series, and the Cyclones won Game 1 4–2.The Ice came back and won Game 2 4–3 in overtime, and then took the series by winning 1–0 in Game 3 in Cincinnati.