Dennis Patrick has cropped up a few more times again, I think mostly in Cannon.
Funny you should mention Dennis Patrick because I just finished watching the
Barnaby Jones that I'd recorded yesterday and who should have been one of the guest stars but Dennis Patrick. Though, unlike John Karlen, he wasn't a complete surprise because he was billed at the beginning.
And just in case anyone would like to watch out for DP's ep if it should happen to run on MeTV again, it was the 16th ep from Season 6 and was called
A Ransom in Diamonds.
Unfortunately, no photo of DP on IMDb...