Star Trek's Chekov actor Walter Koenig dies at 90

Walter Koenig, who played the eager Russian navigator Pavel Chekov in the original Star Trek series, has died aged 90. He joined the show in 1967, reprised the role in six films until 1991, and later played telepath Alfred Bester in Babylon 5. Co-star George Takei paid tribute, calling him a writer, teacher and loyal friend.