LH-HK rallied with three straight goals in the third period to take a 4-3 lead, gave up a tying goal with 1:40 to play in regulation, but rebounded to win 5-4 when DeMorro converted a feed from Rocko Cuccaro 5:51 into overtime.
The victory put LH-HK at 8-10 overall and that puts the second-year co-op team in the CIAC Division III tournament.
DeMorro finished with two goals. Cuccaro and C.J. Tangredi each had one goal and two assists.
Kyle Stoddard set up two goals, including the game-tying goal by Nick Baccaro midway through the third period.
One minute later, Cuccaro netted the goal that put LH-HK up 4-3. He was assisted by Tangredi and Manny Castro.