Silent Witness has released a video in the hope that someone might be able to identify the suspect in connection with the death of David Denogean.
The video contains two views one from a distance the other zoomed in showing the same events.
The suspect is seen running up to David pointing a gun and shooting before running southbound.
David Denogean, a teacher with the Phoenix Union High School District, was killed while walking his dog near 12th Street and Maryland Avenue on Nov. 25.