In a bombshell new development in the Natalie Wood case, the late actress’ former co-star, Christopher Walken, has secretly gone in for a police interview, The National ENQUIRER can exclusively reveal.

Lt. John Corina of the Los Angeles County Sheriff’s homicide division, who is heading the reopened investigation into the “West Side Story” beauty’s 1981 mysterious death, confirmed to The ENQUIRER that Walken, now 71, has voluntarily answered questions in the new probe!

In a previous interview with police, the yacht’s captain, Dennis Davern, implicated Natalie’s husband, Robert Wagner, in her death.  Natalie, 43, and Wagner had been entertaining her “Brainstorm” co-star, Walken, on their yacht “Splendour” off California’s Catalina Island when tragedy occurred.

A police informant told The ENQUIRER: “With Davern and now Walken speaking to police, Robert Wagner remains the only one onboard the boat that night not to consent to a new interview. It makes you wonder what Robert is hiding.

“He was implicated by Davern, and certainly police must have asked Walken about what really happened and questioned him about Wagner – and certainly there’s a question of whether Christopher turned on Robert.”

Wagner’s lawyer maintains his client has fully cooperated and is not a suspect. But Lt. Corina told The ENQUIRER detectives repeatedly requested that Wagner, now 84, speak to police, and he’s refused. 

As The ENQUIRER has reported, two witnesses claimed they learned from Walken that Natalie walked in on the actors in bed together. In a panic, according to a documented police theory, she tried to flee the boat.

“Walken was decent enough to voluntarily speak to police and answer their questions,” the source said. “It’s now time for Wagner to man up and talk to cops.”