This undated photo provided by the Denver Police Department shows veteran Denver Police Officer Celena Hollis. Hollis was shot and killed during a free jazz festival, Sunday, June 24, 2012, in Denver.... more 
This undated photo provided by the Denver Police Department shows veteran Denver Police Officer Celena Hollis. Hollis was shot and killed during a free jazz festival, Sunday, June 24, 2012, in Denver. A suspect, Rollen Oliver, was taken into custody late Sunday after witnesses gave a description of the gunman. Police also recovered a gun and said they believe Oliver was the only person involved in the attack. Police Chief Robert White said investigators were not sure if Hollis was the target of the shooting when she answered a call about a disturbance in the park. (AP Photo/Denver Police Department) less 
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Associated Press | Photo By Denver Police Department
Mon, Jun 25, 2012 3:41 PM EDT