yes. she is very much part of the show.
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If you mean the actress Joan Collins, then yes she is still alive and still acting.
liz benson is not death, she is joining with her Husband
He is still acting and performing in a band, a link to his wiki page is below.
Yes Alan Alda (Hawkeye) is still alive and acting he has done multiple movies and still appears in various tv shows.
Most of the cast are still acting, although many have passed on and most of them are in there 80s and 90s, they still are remembered and recognized for their work in Mash.