In 1970 West was offered the role of James Bond. He turned it down, believing that an English actor should play the role. The role instead went to the strikingly similar actor (in acting methodology, wit, charm and even appearance) Roger Moore.
West made numerous small film and television appearances in the 1970s and 1980s, but was typecast by his performance as Bruce Wayne/Batman. In 1992 his situation was lampshaded in an episode of Batman: The Animated Series, where Batman encounters a washed-up actor who starred in his favourite childhood TV series, "The Grey Ghost", and hasn't been able to work since. The writers were uncertain if they were being disrespectful by offering West the role, but he snapped it up and enjoyed playing a character with real depth. Shortly after this he played himself on the popular Mr. Plow episode of The Simpsons.
These roles led to a career resurgence. In 1994 he joined the cast of the short-lived cult anthology comedy series Danger Theatre. West played the police captain of a Hawaii-based crime-fighting unit, parodying his role of Bruce Wayne by being almost completely inept. In 2000 he started playing himself on Family Guy. In this role he was the mayor of the town of Qahog, the main setting for the show, and made frequent appearances in a supporting role. His vocal skills also saw him appearing on Futurama and Rugrats.
RIP Adam West, whose comedic (but straight-faced) reinterpretation of Batman remains one of the character's most memorable versions.
ETA: According to io9, West had completed work on Batman vs. Two-Face and it will be out later this year.