LOS ANGELES (AP) — Robert Wagner has declined to be interviewed by detectives in a renewed inquiry into the drowning death of his wife Natalie Wood three decades ago, an investigator said Thursday.

Wagner was interviewed by authorities soon after Wood's drowning in 1981, but the actor is the only person who was on the yacht the night Wood died who has not spoken to detectives as part of the latest inquiry, despite repeated requests and attempts, sheriff's Lt. John Corina said.

Blair Berk, an attorney for Wagner and his family, said the actor had cooperated with authorities since his wife died.

Detectives began re-investigating the case in November 2011. Since then investigators have interviewed more than 100 people, but Wagner has refused and Corina said the actor's representatives have not given any reason for his silence.

The detective's remarks provided new insight into the case that has remained one of Hollywood's enduring mysteries. Earlier this week, coroner's officials released an updated autopsy report that had been under a security hold. It detailed why Wood's death had been reclassified from an accidental drowning to a drowning caused by "undetermined factors."

"Mr. Wagner has fully cooperated over the last 30 years in the investigation of the accidental drowning of his wife in 1981," Berk said in a prepared statement. "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."

After 30 years, Berk said, neither Wagner nor his daughters have any new information to add. She said the latest investigation was prompted by people seeking to exploit and sensationalize the 30th anniversary of the death.

The renewed inquiry came after the yacht's captain Dennis Davern told "48 Hours" and the "Today" show that he heard Wagner and Wood arguing the night of her disappearance and believed Wagner was to blame for her death.

Authorities have not identified any suspects in the case.

Wood, 43, was on a yacht with Wagner, Christopher Walken and the boat captain on Thanksgiving weekend of 1981 before she somehow ended up in the water.

Corina said Walken gave a prepared statement and spoke to detectives for an hour.

Detectives have also interviewed other actors who knew both Wagner and Wood to learn more about their relationship.

Corina said detectives have tried at least 10 times to interview Wagner but have been refused. He said some of the refusals have come from the actor's attorney, and that detectives at one point traveled to Colorado to try to speak with Wagner but were unsuccessful.

Corina said the latest inquiry had turned up new evidence.

"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."

Asked if the information might lead to criminal charges, Corina said that would be up to prosecutors if they are presented a case.

"All we can do is collect the facts," he said. "We're still trying to collect all the facts." Continued...