HOUSTON --A third suspect has been arrested in a fatal drive-by shooting and police are asking for the public's assistance in identifying others possibly involved. Dion White, 27, is in custody and charged with murder. He is accused in the killing of Craig Lyn Robertson, 18, at 5050 Sunflower about 10:30pm on March 12. Two other suspects -- Levelle Dequan Vigne, 18, arrested on April 25, and Anthony R. Jenkins, 21, arrested on April 12 -- are charged with murder for their roles in Robertson's death. Police say officers responded to a shooting call March 12 in the parking lot of the Sunflower Terrace Apartments and found a vehicle that had collided with two other vehicles parked in the lot. Officers approached the vehicle and found Mr. Robertson slumped over in the front passenger's seat. Robertson was pronounced dead at the scene. Witnesses reported seeing a truck drive by them and someone firing shots at them. Moments later, a car drove by and someone from inside fired shots at Robertson's vehicle. The suspects in both vehicles then fled the scene. The pickup truck used in the shooting was recovered a day after the shooting in the 6700 block of Dumble. The investigation developed information on Jenkins and Vigne being suspects in the case and both were subsequently arrested. Further investigation identified White as a third suspect in this case. He was arrested on Wednesday without incident. Houston police say he has admitted to investigators his involvement in this incident. Investigators believe there are other unidentified suspects involved in the shooting. Anyone with information on the identities of other suspects believed involved in this case is urged to contact the HPD Homicide Division at 713-308-3600 or Crime Stoppers at 713-222-TIPS. There is a cash reward.