https://www.metv.com/stories/heres-why-darren-mcgavin-steered-clear-of-any-romance-in-kolchak-the-night-stalker

The only ladies that Kolchak was interested in were lady monsters.

Darren McGavin was once called the John Wayne of monster chasers (https://www.metv.com/stories/darren-mcgavin-was-once-called-the-john-wayne-of-monster-chasers)

Admittedly, it's hard to picture John Wayne chasing after a vampire like Kolchak does.