Prominent actress and popular socialite who became vice chairperson of RKO Pictures. She appeared with Cary Grant in The Sundowners and Butterfield 8 starting in 1960, and also appeared in The Player in 1992.
She was a student at Miss Porter's School and George Washington University, from which she dropped out to pursue an acting education at the American Academy of Dramatic Arts.
She performed in Desk Set in 1957 and in Operation Petticoat in 1959.
Her birth name was Dina Hutton, but she changed her last name to Merrill as an act of rebellion towards her father, whom hated that she pursued acting. She was the only daughter of Marjorie Merriweather Post, the heiress to the Post Cereals empire.
She was a trustee of the Eugene O'Neill Theater Foundation.