I had a really had time finding a reputable MSM link....he was cleared last spring when the last remaining detective on the case retired. Around the same time the Sheriff's Dept gave an interview clearing him.
Natalie Wood: Watch the star in hidden gem 'The Green Promise'
Wagner was declared a person of interest in Natalie Wood’s death in 2018, but the sheriff's department has since cleared the actor.
The Los Angeles County Sheriff’s Department has cleared Robert Wagner in its investigation into the death of his late wife Natalie Wood.Robert Wagner cleared as Natalie Wood case goes cold
“All leads in the Natalie Wood case have been exhausted, and the case remains an open, unsolved case,” the Los Angeles County Sheriff’s Department said.pagesix.com
“All leads in the Natalie Wood case have been exhausted, and the case remains an open, unsolved case,” Lt. Hugo Reynaga told Page Six Friday.
If its still officially open and unsolved, that doesn't seem to absolve Wagner of any guilt. He was the last person who was with her.