He declined to give further details on the traffic stop, but said police are questioning Bautista and a passenger who was in the car.
Police want to talk to Bautista about the death of Norma Leticia Martinez. Martinez was found injured in front of Our Lady Star of the Sea church at 1385 Michigan Ave. at about 6:45 a.m. Monday. She died later at a hospital.
Police said it appears Martinez was pulled along the street by a vehicle for at least a block, but it is unclear whether she was dragged or was holding onto the car.
Martinez's older sister said Tuesday that the two women were involved in an on-again off-again romantic relationship and had recently broken up.