David Birney passed away April 27th (this article and others are wrong). There is mention of his H50 appearances in this story.

https://www.tvinsider.com/1043064/br...ey-dies-at-83/

He was on the show 3 times:

- The Silk Trap (1978) ... John Richard Carr
- Murder: Eyes Only (1975) ... Lt. Waldron
- Follow the White Brick Road (1972) ... Damage Controlman 3C John Dillon