A neighbor reported hearing shots fired at 6:42 a.m. Sunday at a residence in the 1500 block of San Pedro Point Court in Chula Vista, police Lt. Daniel Hardman said.When officers arrived, a man waved them toward the home where the shooting occurred. The man directed officers to the second floor of the residence where they found the victim suffering from a gunshot wound, Hardman said.There were two other people in the house at the time of the shooting, but police say they did not witness the shooting. Sources told 10News one of those was the victims girlfriend, who was cradling the victim when police arrived. Paramedics arrived quickly and performed CPR but the victim died at the scene, he said. The victim's identity has not been released.Homicide investigators set up a perimeter around the home, interviewed potential witnesses and searched the area, Hardman said.Police had a Dodge Charger towed away from the scene. Investigators also packed up a piece of rolled carpet. A 26-year-old man was arrested in connection with the shooting several blocks from where it occurred. Friends identified him to 10News as Dwayne Ramsay. Police said the two had been arguing before the shots were fired. A handgun was found on the second floor of the home. Charles Dawes, who says he is good friends with Ramsay, called him very friendly. Dawes said he did not know the victim as well and does not know what could have led to the shooting. "They were like best friends," he said. "Anytime you see them, they were together." Investigators did not know what motivated the shooting.Ramsay was booked into jail on charges of murder and being under the influence of a controlled substance.