Forever Knight S03 E07 Hearts of Darkness

"13TH CENTURY VAMPIRE. 20TH CENTURY COP."

A patron of the Raven is found dead, apparently killed by a vampire in unusual circumstances. The woman at the scene has no memory, and there are no clues. Nick must find the vampire-killer before he strikes again, while keeping Tracy out of trouble. For Tracy is aware it is a vampire, and is searching for the killer, too.