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DENVER (AP) -- Colleagues of a slain Denver police officer who was shot while trying to break up a fight are continuing some unfinished work for her.

Officer Celena Hollis planned to have Denver's Black Police Officers Organization host a bone marrow drive to increase the number of African-American donors. The organization held the drive in her honor on Friday.

She wanted to find more donors after hearing about a Colorado Army National Guard member in need of a live-saving marrow or stem cell transplant.

Hollis was killed on June 24 while trying to break up a fight following a free jazz concert at Denver's City Park.

Twenty-one-year-old Rollin Olliver is accused of firing multiple rounds during the altercation. Hollis, a former Detroit police officer, was shot in the head.

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