Thousands of people attended a jazz concert in Denver's City Park on Sunday night to honor Denver Police Officer Celena Hollis.Hollis was shot and killed one week earlier trying to break up a fight at Jazz in the Park.People who attended the event had a message: Denver won't bow down to violence."We push back together on what is not right, what is evil and doesn't mean us any good," said Denver Mayor Michael Hancock."I think we all have to say enough is enough and that we're all going to take back this community -- block by block and neighborhood by neighborhood," said Denver Police Chief Robert White.Before the event, a fundraiser was held for Hollis' family. The organizers raised $6,000.At the concert, attendees gave Hollis' family a standing ovation. It brought some members of her family to tears.Some in the audience said they came to the concert and wore purple, Hollis' favorite color, to send a message."We decided to make some signs to show support for the police and say this is our park, our city," said Dave Bednarz.
Hollis was a single mother raising a 12-year-old daughter, and was well-known in the department and in Denver, said Hancock."She was a very pleasant, extremely pleasant, polite officer. She had a phenomenal reputation," White added.Hollis had spent seven years in the Denver Police Department and was an officer on the police force in Detroit before she transferred in October 2005."She served as a patrol officer in District Two and was a member of the Street Crime Attack Team (SCAT)," according to an online bio on the Denver Police Department's website. She used her Critical Incident Training skills to de-escalate several hostile and potentially violent incidents, including successfully assisting an Iraqi war veteran who suffered from PTSD. Officer Hollis has been recognized numerous times for her outstanding performance and service to the communit. She was an amazing person with an engaging smile who was well liked and respected by her colleagues and the community she served. She will be missed."Donations for Officer Hollis daughter and family can be made to the Celena Hollis Memorial Fund, Rocky Mountain Law Enforcement FCU, 700 W. 39th Avenue, Denver, CO 80216.Hollis is the first Denver police officer killed in the line of duty since 2005.Officers arrested 21-year-old Rollin Michael Oliver for investigation of first-degree murder. He is being held without bail. He was in possession of a weapon when he was arrested, said White.