Walter Marvin Koenig (born September 14, 1936 in Chicago, Illinois, USA) is an actor. He played the character Pavel Chekov in the original Star Trek television series and in the several movies that featured the original cast. He is of Lithuanian descent. He attended Grinnell College in Grinnell, Iowa.
After Chekov, his best-known role is the Psi Cop Alfred Bester in Babylon 5.
He has been married since 1965 to Judy Levitt and has one son, Andrew Koenig.
He was cast as Chekov due to his resemblance to Davy Jones, to attract the younger audience, especially females.
He had heart bypass surgery in 1993.