The memorial was held in Ordway, near the prison. Hundreds of law enforcement and corrections officers from across the country came to honor Sgt. Ricard; some from as far away as New York City.
Director of Prisons Tony Carochi recalled working with Sgt. Ricard while he was warden at another prison.
"Mary left a career as a pastry chef because it was not enough for her," he said. "She had a dream. She wanted to impact people's lives. It was clear to all who worked with her that she was dedicated and driven to make a difference."
Sgt. Lori Gann was seriously injured in the incident.
Miguel Alonso Contreras-Perez, who was serving 35 years to life for kidnapping and sexual assault, has been named a person of interest in Ricard's death.
Ricard leaves behind a husband, four children and nine grandchildren.
(KUSA-TV © 2012 Multimedia Holdings Corporation with The Associated Press)