HOUSTON --Police have arrested a second suspect for a murder on Houston's south side in March, but are still looking for additional shooters. Levelle Dequan Vigne, 18, is in custody and charged with murder. One other suspect, Anthony R. Jenkins, 21, was arrested on April 12 and is also charged with murder in the same court. Police say officers responded to a shooting call 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 Craig Robertson, 18, 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 being one suspect in the case and he was arrested two weeks ago. Further investigation identified Vigne as a second suspect in this case. He was arrested on April 25 without incident. 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.