Forever Knight.S2E24.The Code

Forever Knight is a 1992 - 1996 Canadian television series about Nick Knight (Geraint Wyn Davies), an 800-year-old vampire working as a police detective in modern-day Toronto, Ontario. Wracked with guilt for centuries of killing others, he seeks redemption by working as a homicide detective on the night shift while struggling to find a way to become human again.
S2E24 - The Code
Feeling the winter blues, Schanke disagrees with Nick about the suspects in a string of accidental poisonings case when Schanke's old partner, retired in Arizona, provides his input.

Aka: Ein Freund fuers Leben (A Friend for Life)

Guest Starring:
Joseph Ziegler (Delehanty)

Cast:
David Nerman (Wade)
Bridget Giggs (Gwen)
Anna-Louse Richardson (Irene)
Conrad Bergschnieder (Duke)
Ron Hastings (Prospector)

Written by Michael Sadowski
Directed by Clay Borris