Actor Alan Ladd was born 110 years ago this month, and we're celebrating his life and career with four of his old time radio appearances. He plays mystery writer and amateur gumshoe Dan Holiday in "Diamond in the Sky" and "The Professor and the Puzzle," a pair of syndicated adventures from Box 13. Plus, he recreates his big screen role (and reunites with Veronica Lake) in The Blue Dahlia from The Screen Guild Theatre (originally aired on NBC on April 21, 1949) and he steps into the shoes of Walter Neff in Double Indemnity from Hollywood Star Time (originally aired on CBS on June 22, 1946).