Investigators arrested 20-year-old Dion Rankin of Englewood on suspicion first degree homicide.
Officers were called to the 5400 block of South Fox street in Littleton on Oct. 19 to reports of shots fired.
On scene, they discovered Da Von Flores lying in the street. The 18-year-old was pronounced dead at the scene.
A 17-year-old was also injured, but police have not released his identity since he is a juvenile.
Investigators believe the murder was a result of a house party at a nearby home on Fox Street.
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