Robert Wagner and Natalie Wood Robert Wagner and Natalie Wood

Police say Robert Wagner has declined to be interviewed in its re-opened investigation into his wife Natalie Wood's death, The Associated Press reports. 

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According to Lt. John Corina of the Los Angeles County Sheriff's Office, Wagner is the only person who was on the yacht the night Wood drowned in 1981 who has not spoken to authorities as part of the latest investigation, which was re-opened in 2011, "despite repeated requests and attempts."

Blair Berk, an attorney for Wagner and his family, said in a statement that the actor has cooperated with officials and had no new information to add.

"Mr. Wagner has fully cooperated over the last 30 years in the investigation of the accidental drowning of his wife in 1981," Berk said. "Mr. Wagner has been interviewed on multiple occasions by the Los Angeles sheriff's department and answered every single question asked of him by detectives during those interviews."

Wood drowned while she was yachting with Wagner and Christopher Walken. Wagner told investigators at the time that Wood fell off the dock while trying to re-tie a dinghy, and her death was ruled an accidental drowning. In 2011, the boat's captain Dennis Davern co-authored a book implicating Wagner in Wood's death, which led the coroner's office to re-characterize the cause of death as "undetermined," and the case was reopened. The following year, the cause of death on Wood's death certificate was changed from accidental drowning to "drowning and other undetermined factors." Officials also amended the certificate to state that the reasons leading to Wood ending up in the water are "not clearly established." On Monday, the updated coroner's report was released and revealed that the actress might have been assaulted before her drowning.

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Since the case has been re-opened, Corina said authorities have interviewed Walken and other actors who knew Wagner and Wood to learn more about their relationship. "Most of the people we've talked to were never talked to 30 years ago," he said. "We've got a lot of new information."

Despite the new information, police have not identified any suspects.