Cause of death revealed for ‘Star Trek’ actor Walter Koenig

“Star Trek” actor Walter Koenig’s cause of death was cardiopulmonary arrest with chronic diastolic congestive heart failure as an underlying cause, according to his death certificate.Read more trending news Koenig, 90, who played Russian crewman Pavel Andreievich Chekov during the second and third seasons of “Star Trek” and in the first seven Paramount movies based on the series, died on Oct. 25. People and TMZ obtained the death certificate.‘Star Trek’ Actor Walter Koenig’s Cause of Death Revealed: Report https://t.co/tQouKPKjm8 People (@people) November 3, 2026 TMZ was the first outlet to report Koenig’s cause of death.The son of Lithuanian immigrants, Koenig also played Alfred Bester on another science-fiction series, “Babylon 5,” the entertainment news website reported.Walter Koenig, who played Russian crewman Chekov in ‘Star Trek,’ dies at 90Koenig joined the “Star Trek” cast for the start of its second season on television, appearing in 36 of the 50 episodes that aired in 1967-6