The official cause of death of 'Star Trek' actor Walter Koenig, who died aged 90, has been revealed

Walter Koenig, the actor best known for playing Ensign Pavel Chekov in the original 'Star Trek' series, died aged 90 and his official cause of death has now been released by authorities. Koenig had been a beloved fixture of the franchise for decades, appearing across the television series and multiple films.

Koenig remained active in fan conventions and science fiction circles well into his later years, making him a figure of lasting affection for 'Star Trek' devotees worldwide.