OKLAHOMA CITY - A jury yesterday convicted an Oklahoma City pharmacist of first-degree murder, saying he went too far when he pumped six bullets into a teenager who tried to rob his drug store.

Jerome Ersland, 59, had been hailed as a hero for protecting two co-workers during the May 19, 2009, robbery attempt at the Reliable Discount Pharmacy in a crime-ridden neighborhood in south Oklahoma City.

A prosecutor, however, said that after Ersland shot Antwun Parker in the head, knocking the 16-year-old to the ground, Ersland made himself "judge, jury, executioner" by getting a second handgun and shooting the boy five times in the abdomen. A coroner's report said the gut shots killed Parker.

Ersland, a former Air Force lieutenant colonel, worked at a pharmacy that had been robbed before. Immediately after the shooting, anti-crime advocates and many listeners and viewers of talk shows called Ersland's actions heroic.