Actor Robert Stack is undergoing radiation treatment for prostate cancer. The 83-year-old, who gained fame as crimebuster Eliot Ness on the sixties TV series The Untouchables and as host of the reality show Unsolved Mysteries, is receiving outpatient treatment, said his publicist, Jerry Pam. "He's fine," Pam said. He added that Stack is part of "a club" of men who've been diagnosed with the disease, including Pam himself and former New York mayor Rudolph Giuliani. AP