Tough guy actor dies aged 93.
His widow, Susan Blanchard, said he died at his farm home in Connecticut on Monday.
He made his film debut in 1947 as a killer in Kiss of Death and became a leading man in Broken Lance, Two Rode Together and 40 other films.
He also starred in Madigan, a 1968 film with Widmark as a loner detective that became a short-lived TV series.
The performance in Kiss of Death won him an Academy Award nomination as supporting actor, his only mention for an Oscar. A quiet, shy man, Widmark was an ardent supporter of gun control.
He was born on December 26, 1914, in Sunrise, Minnesota, where his father ran a store before settling in Princeton. Two years out of college, Widmark reached New York in 1938 during the heyday of radio. His mellow Midwest voice made him a favourite in soap operas and he found himself racing from studio to studio.
Rejected by the Army because of a punctured eardrum, he began appearing in theatre and films, including The Alamo with John Wayne.