Lana Wood, 71, tells DailyMail.com that she is 'frustrated' that the LA District Attorney's Office has yet to press charges against anyone for her sister's murder. In the past Lana has said she believes Natalie's husband Robert Wagner, in her mind, is the prime suspect, a claim she is less vocal about today. Wagner, now 87, was named a person of interest by Los Angeles sheriffs, it was reported yesterday. She said: 'I feel we're so close to finding out what happened to my sister, but it's very frustrating, they have moved the case forward and made substantial inroads, but still haven't pressed charges.' West Side Story actress Natalie was found washed up on an island off the coast of California in 1981 amid mysterious circumstances following an alleged blazing row with her husband, Wagner, on their yacht.