Police Tuesday arrested a 29-year-old man suspected of being an accomplice to a teenage boy who was shot and killed during an alleged armed robbery in Long Beach.

Officers arrived at the scene of the May 28 shooting and found 17-year-old Guillermo Mayorga III, of Riverdale, Georgia, mortally wounded in a hotel parking lot in the 3600 block of Santa Fe Avenue about 11:20 p.m., according to police. He was pronounced dead at the scene.

The robbery victim, whose name and age were withheld, was found in a hotel room with a gunshot wound to his upper body, police said. Paramedics took him to a hospital with stable vital signs.

The preliminary investigation revealed Mayorga targeted the victim in the parking lot while his alleged accomplice, Michael Purinton of Long Beach, joined in the robbery, police said.

Investigators believe Mayorga fired multiple rounds from a handgun, striking the robbery victim and Purinton, who fled the scene on foot and remained at large until his arrest late Tuesday morning near his residence in the area of Spring Street and Pacific Avenue.

The struggle between Mayorga and the robbery victim continued until a third person — described only as a man — became involved and shot Mayorga, police said. That man then fled the scene, but went to Long Beach Police Department headquarters the afternoon of June 10 and was interviewed by detectives.

Investigators determined that the man’s actions were taken in defense of the original robbery victim, a conclusion which police said was corroborated by supporting evidence and video surveillance footage. The man, whose name was not released, was not arrested.

Purinton, who was arrested without incident about 11:50 a.m. Tuesday, was booked into the Long Beach City Jail on suspicion of robbery, with bail set at $50,000.

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