Walter_Koenig played Pavel Chekov and he eventually lost his son.
https://www.imdb.com/name/nm0000479/
Walter Koenig: In Conversation https://www.youtube.com/watch?v=Z3vzNfxpgZ8 The Roddenberry Archive
https://collider.com/star-trek-pavel-chekov-walter-koenig-audition
His son Andrew_Koenig died in 2010.
https://en.wikipedia.org/wiki/Pavel_Chekov
https://en.wikipedia.org/wiki/Pavel_Chekov#Reboot_films
Anton_Yelchin played Pavel Chekov and eventually lost his life.
https://en.wikipedia.org/wiki/Pavel_Chekov#Anton_Yelchin's_death 2016
