Mar 1970 - Detective Comics

Bruce Wayne is hosting a charity auction when some thugs in scuba gear show up and steal a worthless painting. Batman uses infra-red goggles to follow the thugs nuclear powered mini-sub to an eccentric billionaire's castle where Batman finds his painting and several other works of art that used the same model. The billionaire tries to kill Batman and fails, but not before telling Batman that he was in love with the opera singer that was the model for all the stolen art. Batman decides the guy is crazy and tells commissioner Gordon to  have the guy committed, which Commissioner Gordon promptly does.
Batgirl foils a serial killer targeting red-heads that he finds using a computer dating service. He thought Batgirl/Barbara Gordon was to beautiful to kill. Idiot.