Which American artist painted this picture?

Frederic Sackrider Remington (October 4, 1861 – December 26, 1909) was an American painter, illustrator, sculptor, and writer who specialized in depictions of the Old American West, specifically concentrating on the last quarter of the 19th-century American West and images of cowboys, American Indians, and the U. S. Cavalry.

Frederic Remington was also a cousin to Eliphalet Remington, founder of the Remington Arms Company which is considered to be America's oldest gunmaker. He was related, as well, to three famous mountain men—Jedediah S. Smith, Jonathan T. Warner and Robert "Doc" Newell. On the Warner side of his family, Frederic Remington was related to General George Washington, America's first president.

This particular painting is called "Turn Him Loose, Bill". This is an oil on canvas painting that is 33" x 25" and was painted circa 1893. The painting is done in the Naturalism style, which is a type of art that shows realistic objects in a natural setting.