Walter Koenig, who played Chekov on 'Star Trek,' dies at 90

1. What happened

   According to The Hollywood Reporter, actor Walter Koenig, known for playing the Russian crewman Chekov on 'Star Trek,' has died at age 90.

2. When it started

   The source headline reports the death but the details available here do not state the exact date.

3. How it spread

   The report is based on The Hollywood Reporter's coverage; the cause of death is not stated in the information provided.

4. Why it matters

   Koenig was a recognizable member of the original 'Star Trek' cast, so his death drew attention from fans and the entertainment press.