Natalie Wood’s childhood pal has broken decades of silence to accuse Robert Wagner of having a hand in her death, RadarOnline.com has exclusively learned.<br /><br />Ed Canevari — who grew up with Natalie in Santa Rosa, Calif. — is demanding investigators ramp up their case against her husband after Wagner was named a “person of interest.”<br /><br />“They should have done it 37 years ago!” the 80-year-old former deli owner exclusively told Radar.<br /><br />“I just believe that Robert Wagner did it. I think it was covered up.”<br /><br />an “accident,” as originally ruled.<br /><br />He even recalls at the time telling Natalie’s mother, Maria Gurdin: “I don’t believe it.”<br /><br />Brunette beauty Natalie vanished off her 60-foot yacht, the “Splendour,” after a vicious fight with her hubby, who thought she was having an affair with “Brainstorm” co-star Christopher Walken.<br /><br />The former “Hart to Hart” star has insisted the 43-year-old actress accidentally fell into the Pacific Ocean, but Ed questioned that alibi.<br /><br />PHOTOS: Shocking! 18 Celeb Domestic Violence Scandals That Rocked Hollywood</a><br /><br />For years, Ed joined a young Natalie and her family for summer vacations at a river in Sonoma County.<br /><br />Everyone cooled down by the water — except the beloved star, he said.<br /><br />“She wouldn’t go to the river’s edge,” Ed recalled.<br /><br />We pay for juicy info! Do you have a story for RadarOnline.com? Email us at tips@radaronline.com, or call us at (866) ON-RADAR (667-2327) any time, day or night.