A fingerprint lifted from Antoine Walker's stolen Mercedes CL550 belongs to one of four men being questioned in last month's robbery of the NBA star at his $4 million River North home, sources said Thursday.

Video surveillance from an alley near his home helped identify the suspects. Phone records showed they were talking to one another in the hours leading up to the home invasion, sources said.

Walker, a Miami Heat forward, was robbed of $200,000 in jewelry and cash July 10. His black two-door Mercedes was recovered by police on the West Side. The car was stripped of its wheels and stereo.