TUCSON, Ariz. (AP) -- Authorities say a suspect wanted in connection with a fatal shooting in Tucson last week now is in custody.Tucson police say 18-year-old Madison Michael Molina was arrested without incident Wednesday after a traffic stop.They say the officer who pulled over the vehicle realized the driver was Molina, who was wanted on a felony warrant.Molina is being held on suspicion of first-degree murder. It's unclear if he has a lawyer yet.Police say Molina is suspected of shooting 30-year-old Diego Valdez in front of a business last Friday morning.Valdez later died at a hospital. Police have said the shooting appears to be gang-related.© 2014 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.