From Variety.com ...
'Star Trek' Actor Robert Walker Jr. Dies at 79
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Robert Walker Jr., son of actors Robert Walker and
Jennifer Jones, died Thursday, his family confirmed
to the official website for the television show
"Star Trek." He was 79.
Walker Jr. is best remembered for playing the
titular Charlie Evans in the "Star Trek" episode
"Charlie X" from the show's first season in 1966.
His character was a teenage social misfit with
psychic powers. The episode was written by D.C.
Fontana who also died earlier this week.
Walker Jr. also starred in a handful of 1960s
pictures including "Ensign Pulver" with Burl Ives
and Walter Matthau, and "Young Billy Young."
He was born in Queens, New York in 1940, by which
time his father was just launching his career as an
actor. Walker Sr. was of course best known for
playing the role of murderous psychopath Bruno
Antony in Alfred Hitchcok's "Strangers on a Train."
The film was released shortly before his death of a
suspected overdose in 1951. Jones was also a highly
successful actress who was nominated for five
Academy Awards, winning one for playing Bernadette
Soubirous in 1943's "The Song of Bernadette."
Walker Sr. and Jones divorced in 1945, with the
latter re-marrying "Gone With the Wind" and
"Rebecca" producer David O. Selznick.
In 1967, Walker Jr. starred in "The War Dragon" with
John Wayne and Kirk Douglas. His career throughout
the '80s and '90s mostly consisted of guest
appearances in TV shows, including two cameos in
"Murder, She Wrote" opposite Angela Lansbury. Later
on in his TV career, Walker Jr. appeared in "L.A. Law"
and "In the Heat of the Night," both in 1991.
His final screen credit was a small role in the 2018
thriller "Beyond the Darkness."
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https://variety.com/2019/tv/news/star-trek-actor-robert-walker-jr-dies-79-1203427571/>