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Isam Dart

1858–1900

United States

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Biography

Isam Dart (1858–October 3, 1900), also known as Isom, was a cattle driver, rancher, and horse and cattle rustler during the late 19th century in the Wild West. He settled in Browns Park in northwestern Colorado, where he was considered by his neighbors to be a "superlative rider and roper, a good neighbor, and an expert and industrious cattle thief." He and his partner Mat Rash were gunned down in separate events and were believed to have been assassinated by Tom Horn, a hired gunman. In one Butch Cassidy biography, published in 1927 and updated in 1959, a detailed six-page account of Dart's life is offered in the author's broader description of the Brown's Hole area of Colorado, Utah, and Wyoming.

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Biography text · CC BY-SA 4.0 · Source checked 2026-10-13

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