Candidate for Crime (1973) with Tisha Sterling (soon to be 81) and some other actors (including the director's daughter Katey Sagal as Jackie Cooper's secretary).

I can't remember the name of the episode but he fell down a hill. Turns out that was a real fall they kept in the show.

I watched a bunch of those

The one with Jack Cassidy.

The one where he almost walks out the door, before turning back and saying “Just one more thing…”

Columbo goes to the guillotine. I remember the first time I watched it, higher than a kite, and the murder scene totally freaked me out.

The original movie,Prescription Murder with Gene Barry

It has been years since watching any episodes, but they are all good.