Conversation so far:
what happened with dan dierdorf in 1974?
During his peak years from 1974 to 1978, Dierdorf was regarded as one of the best offensive lineman in the NFL.
Are there any other interesting aspects about this article?
From 1974 to 1976, Dierdorf started every game at right tackle for the Cardinals during a three-year span.
what did he do after the three years?
Dierdorf did not allow a sack during the entire 1976 and 1977 seasons.

Question: what did he do after the 1977 season?
Self-contained rewrite: what did Dan Dierdorf do after the 1977 season?