In the link below there is another link to the security video. It doesn't look good for the pharmacist.
http://www.kfor.com/news/sns-ap-ok--pharmacyshooting,0,2415801.story
OKLAHOMA CITY (AP) — An Oklahoma City pharmacist who shot and killed a 16-year-old would-be robber has been charged with first-degree murder.
Oklahoma County District Attorney David Prater said Wednesday that 57-year-old Jerome Ersland was justified in shooting Antwun Parker once in the head on May 19. But Prater says Ersland went too far when he shot Parker five more times in the abdomen while Parker lay unconscious on the floor.
Ersland's attorney — Irven Box — says Ersland was protecting himself and two women inside the pharmacy.
Prater showed a security video in which two men burst into the pharmacy and one being shot. Ersland is seen chasing the second man outside before returning, walking past Parker to get a second gun then going back to Parker and opening fire.