Walker was driving a black Mercedes without the lights on when he was pulled over at 5:39 a.m., according to the arrest report. He refused a breathalyzer test.
Walker was a three-time All-Star forward for the Boston Celtics and helped the Miami Heat win the NBA championship in 2006. He was also a starting forward on Kentucky's 1996 national title team.
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His up-and-down career has often been just as tumultuous off the court.
In July 2007, Walker and a relative were bound at gunpoint while multiple robbers took a car, cash and jewelry from his suburban-Chicago residence. He also was the victim of an armed robbery in 2000 along with center Nazr Mohammed as the two sat in a vehicle waiting for a restaurant to open on Chicago's South Side.
And his once prominent career has since faded.
Walker struggled in 46 games with the Minnesota Timberwolves last season. His contract was bought out by the Memphis Grizzlies in December, making him a free agent.
But he was often dogged by fans late in his career for his poor conditioning, briefly being suspended by then-Heat coach Pat Riley over his body-fat level.
The 6-foot-9, 245-pound forward has not played this season but has indicated he wants to sign with another NBA team.