Chilling video shows the moments right after the shooting on Fidelity Street in College Station Monday.
The cell phone video was recorded by Rigo Cisneros a former Army medic who lives on Fidelity.
Cisneros tells News Three that he heard the gunshots and went outside to see if he could help.
Police held him back until the scene was cleared and then he helped perform CPR on Brazos County Constable Brian Bachmann, who later died.
Cisneros said he also briefly spoke to the alleged shooter, Thomas Caffall, who asked for forgiveness for shooting Bachmann.
Caffall was later shot by authorities. He also died of his injuries.