Tray Walker, the Baltimore Ravens cornerback who was injured in a motorcycle accident Thursday night in Miami, died from his injuries Friday—less than 24 hours after the accident, Yahoo! Sports reports. According to the Baltimore Sun, the 23-year-old suffered multiple serious head injuries when the dirt bike he was riding collided with an SUV at an intersection. Walker wasn't wearing a helmet at the time of the accident, and his dirt bike didn't have headlights. The driver of the SUV stayed at the scene. Last year was Walker's first season in the NFL. He appeared in eight games for the Ravens. (More Baltimore Ravens stories.)