Yes he was. Two days after she caught him with another man she filed for divorce.
This is how she died IMO. Robert Wagner, Natalie and Christopher Walken were out drinking. The two men wanted to go back to the boat but Natalie wanted to drink some more so they went without her. She came back sooner than they expected and caught them in bed. She was screaming that she was going to tell the world. That was all Robert and Christopher needed to hear. They knew right then Natalie was never going to make it through the night. Next day her body was found. They got away with murder.
I think there could be some merit to this because he seems obsessed with wearing neck scarves. I watched a documentary produced by his step daughter aimed at clearing his name in the death Natalie Wood once and for all. There were all sorts of archival photos and video footage from the '70's and early 80's of him wearing neckerchiefs. Okay, perhaps that look was fashionable back then and it was common for straight men to adopt that style. But he was being interviewed by his step daughter when the doc. was made (circa 2019), and he was wearing a neck scarf. I don't know - I know he's been happily married to Jill St. John for over 35 years, but that neckerchief in the 21st Century made me think he could swing both ways.
Hey Foster, I know how I came off making the comment I did. Sure, I sound ignorant and very un-2024. But I just thought it was kind of a gay look. I can't help it - when I saw him in 2019 wearing a neckerchief, like the OP, I thought, 'I wonder if he's bi.' Not proud of it, but it seemed responsive the the discussion that was started on this thread.