‘Hart to Hart’ stars Stefanie Powers, Robert Wagner ‘leaned on each other’ after tragic deaths of their lovers

For Stefanie Powers, the show must go on.On Nov. 12, 1981, the “Hart to Hart” star lost her longtime love, actor William Holden, after he suffered a fall in his home. He was 63.Then, on Nov. 29, 1981, Powers’ co-star, Robert Wagner, lost his wife, Natalie Wood. The actress was 43 when she drowned ne…