He replaces Travis Green, who was promoted to head coach of the Canucks.
Corner Brook native Jason King, who had been an assistant on Green’s staff last season, will remain in that job for the Comets
Cull comes the Syracuse Crunch, where he served as an assistant coach in two stints over eight seasons.
The 43-year-old, who also has relatives in Twillingate, appeared in 164 games over three seasons with the AHL Leafs after turning pro in 1994. In all, he played 11 seasons as a defenceman in the AHL and International Hockey League with St. John's, Houston, Springfield, Wilkes-Barre/Scranton and Syracuse.
He was head coach of the Ontario Hockey League's Sudbury Wolves for three seasons.