Rollin Oliver, busted in Denver cop Celena Hollis's murder, reportedly a gang member (12)

Update: More information is emerging about Rollin Oliver, the man arrested following the fatal shooting of Denver Police officer Celena Hollis after a jazz event at City Park on Sunday night -- including increasingly solid reports establishing his gang affiliation. Not that this link offers much comfort to Hollis's family, colleagues and friends, who are still reeling from another senseless act of violence in a summer that's already seen far too many of them.