One year later, Columbia police still working to find who shot, killed 7-year-old Knowledge Sims Police Chief Skip Holbrook is asking for any information that could lead to the arrest of anyone involved with killing 7-year-old Knowledge Sims. Author: PJ Walker Updated: 7:44 PM EDT April 29, 2021 COLUMBIA, S.C. — One year after 7-year-old Knowledge Sims was shot and killed, Columbia police are still working find who is responsible for the death of the Burton Pack Elementary School student. Police Chief Skip Holbrook is asking for any information that could lead to the arrest of anyone involved with killing 7-year-old Knowledge Sims and injuring his 13-year-old sister.