Baltimore Ravens cornerback Tray Walker is in critical condition after a dirt bike crash in Miami, police say. Miami-Dade police say Walker was riding a Honda dirt bike with no lights and wearing dark clothing when he collided with a Ford Escape at about 8pm Thursday, the AP reports. The Ravens say Walker is at Jackson Memorial Hospital. Police are investigating. In a statement, Ravens coach John Harbaugh said, "This is devastating news. Our prayers and hopes are with Tray and his family tonight." WBAL reports that police say alcohol and drugs are not believed to be factors in the crash. (More Baltimore Ravens stories.)