Mosgood, you are thinking of NBC's "Sunday Mystery Movie" from the late 60's thru the mid 70's. It was Columbo, SF Int'l Airport, McMillian & Wife and McCloud that rotated on a weekly basis.
The Night Stalker was on ABC.
Sunking is right. The things that were scary as **** on TV are pretty lame by comparison now. I guess Twilight Zone is one of the few old SciFi shows that still hold up.