[3] He is known for his portrayal of "sidekicks" and "henchmen", such as Bob the Goon in Batman, Cookie in City Slickers, and Malak in Conan the Destroyer.

[1] Walter has acted in six Jonathan Demme films: Something Wild (1986), Married to the Mob (1988), The Silence of the Lambs (1991), Philadelphia (1993), Beloved (1998), and The Manchurian Candidate (2004).

[1] He appeared in a small role with Clint Eastwood in the 1982 film Honkytonk Man[1] and has coined the phrase "Right Cheer" (as in right here) while playing a service station attendant, also attributed to Andy Griffith on his first comedy album What it Was, Was Football (1953).

[citation needed] His portrayal of Miller, the philosopher mechanic of Alex Cox's Repo Man,[1] earned Walter a Saturn Award in 1985 for Best Supporting Actor.

Walter's television credits include guest appearances on WKRP in Cincinnati, Taxi, Charlie's Angels, Hill Street Blues, Amazing Stories, Moonlighting, David Lynch's On the Air, Melrose Place, The Division, Veronica Mars, Criminal Minds and Cold Case.