As reported by History, the couple were reputed thieves, who reportedly traveled throughout Dallas and the surrounding region stealing livestock and cash. As reported by Legends of America, Belle and Jim Reed were accused of committing robbery, theft, and even torturing a older Native American man to learn where he hid an estimated $30,000 worth of gold.

In addition to gaining a reputation for her criminal activity, Belle was known for her elegant sense of style. While riding sidesaddle on her mare, Venus, Belle always wore long skirts, which were often made of black velvet. She was also known for her elaborately plumed hats.

Belle and Jim Reed had two children together: Pearl, who was born in 1868 and Eddie, who was born in 1871. However, as reported by Biography, Belle left her husband and moved back to her parents' farm shortly before his death in 1874. Legends of America reports Reed was ultimately shot to death by a member of his own gang.

Biography reports Belle's specific involvement in her former husband's criminal activities is a point of controversy, as "there is little evidence" proving she participated in any of the assaults, robberies, or thefts. Some historians believe there is more evidence suggesting she sought "to live a life of quiet domesticity." Whatever her intentions, Belle seemed to have a preference for men who were either known or rumored outlaws, and she was often implicated in assisting or participating in their nefarious endeavors.

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