Amy Nelson

Bryson Butterfly, who was an up-and-coming teenage apprentice jockey in Maryland when he was arrested two years ago on first-degree murder charges for his part in a staged robbery that went wrong and killed a 17-year-old high-school student, was sentenced to 20 years in prison Thursday by a Baltimore County Circuit Court judge. Butterfly, now 20, started riding horses as a toddler while growing up on a Native American Indian reservation in rural Washington. He had graduated from Pacific Northwest bush-track horsebacking to being a $2-million winning apprentice based primarily...