Robert 'Bobby' Morris
...is the heavy in "Hey Teach" and George Maharis' buddy in "Four Sweet Corners", the Route 66 "mini-pilot", (very mini), both form the first season. Supposedly he was up for the Todd Stiles part in Route 66 when he died suddenly so Martin Milner wound up with the part.
IMDB links the name "Robert Morris" to a British actor who is still very much alive:
http://www.imdb.com/name/nm0606391/?ref_=fn_al_nm_1
This actor was born in 1940 yet he has credits for American TV series from 1955-1961, when he would have been ages 15-21. The rest of his credits are all in England. He looks nothing like the actor in the Naked City episodes, (who has beady eyes, a very strong jaw line and blonder hair- unfortunately no on-line picture available)
http://www.aveleyman.com/ActorCredit.aspx?ActorID=12410
I suspect Naked City's Robert Morris, (called Bobby in James Rosin's books about Naked City and Route 66), is probably this guy:
http://www.imdb.com/name/nm6334297/?ref_=fn_al_nm_5
---who seems to have died at the appropriate time but has no history other than the dates and places of his birth and death. I suspect that the 1955-61 credits on the British actor belong to this guy.
The past is a series of presents. The present is living history we are privileged to witness