The deranged transgender father who gunned down his ex-wife and one of their sons at a high school hockey game didn’t appear in the “Senior Night” photo hours before the deadly shooting. Robert Dorgan’s son, Colin, was one of the Blackstone Valley Schools players honored on the ice during a pre-game photo op at the Dennis M. Lynch Arena in Pawtucket, Rhode Island, on Feb. 16. Photographer Chip DeLorenzo was on hand to capture the pre-game ceremony and incidentally became the last person to capture a photo of Colin with his mother, Rhonda, and brother, Aidan, 23, before they were...