margot louise hemingway (february 16, 1954-july 1, 1996), later called margaux hemingway, was an american actress and fashion model. she was born in portland, oregon. she was the sister of mariel hemingway. on july 1, 1996, the day before the anniversary of her grandfather ernest hemingway's own suicide, margaux killed herself: she overdosed with a drug called phenobarbital. she was found dead inside her apartment in santa monica, california.