PHOENIX -- Police in Phoenix have arrested a man accused of shooting another man after the two got into a heated argument at a barbeque.Officer James Holmes said Sunday that 50-year-old Mario De La Rosa Masa has been booked on second-degree murder and for illegally possessing a firearm.Authorities say Masa and the 42-year-old victim, Frederico Rosas Moreno, did not get along."They were both tenants on the same property," said Jose Rivera, who witnessed the incident. "They got in an argument. They always drank out here and fought."Authorities say the men got into a fight Saturday afternoon at the barbeque, which was at another person's home near Central Avenue and Broadway Road, and Moreno allegedly struck Masa.Holmes says Masa left but returned several minutes later. He says a second argument ensued and Moreno struck Masa again.That's when Masa allegedly shot Moreno in the torso with a handgun."He probably didn't even realize what he did until he woke up this morning in jail," Rivera said.Moreno later died at a hospital."It's kind of scary because he got up to try to run, but he was blasted in the back, so he fell. Boom," said neighbor Sabrina Montoya. "The guy still had the gun in his hand."