Robert Wagner a 'person of interest' in Natalie Wood’s death

Actor Robert Wagner is being labeled a "person of interest" in the drowning death of Natalie Wood nearly four decades ago.

The Los Angeles County Sheriff's Department said in an upcoming interview with CBS' "48 Hours" that after continuing the investigation over the years, Wagner, now 87, has become of interest since he was the last person to see Wood.

"As we've investigated the case over the last six years, I think he's more of a person of interest now," L.A. County Sheriff's Department Lieutenant John Corina said. "I mean, we know now that he was the last person to be with Natalie before she disappeared."

The actress was married to Wagner from 1972 to her untimely death in 1981.

See photos of Robert Wagner and Natalie Wood together:

The 43-year-old drowned off the coast of Catalina Island, Calif. in November 1981 after she went missing from her family's yacht. Captain Dennis Davern and Wagner's friend actor Christopher Walken were also aboard that fateful evening.

Her death was initially ruled an accident, but in 2011 the case was reopened and a death certificate was issued with the cause being "drowning and other undetermined factors."

"Natalie Wood: Death in Dark Water" will air on Feb. 3 at 10 p.m. on CBS, featuring new witnesses, evidences and theories as to what happened the night of her death.

See more photos of Natalie Wood: