The carjacking happened Monday around 6:25 p.m. on the roof level of a parking structure in the 600 block of South Carondelet Street.
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A 54-year-old man was pronounced dead at the scene with severe head and body trauma.
Investigators say the victim was involved in an argument and fight with another man, who was seen driving the victim's vehicle away from the scene.
Carjacking victim killed at parking structure near MacArthur Park
Authorities were able to find the victim's gray Nissan Frontier pickup truck in the San Fernando Valley around 9 p.m.
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They arrested a man seen removing items from the truck. He was identified as Mitchell Castillo, 36, who has several addresses listed around Los Angeles and appears to be a transient.
Castillo was booked for carjacking.