OMAHA, Neb. (AP) — Jurors have determined a former doctor should be eligible for the death penalty after they convicted him of killing four people with ties to an Omaha medical school.

The jury that convicted Anthony Garcia this week took only 30 minutes Friday to find aggravating factors in his crimes, including the heinous nature of the killings. Under Nebraska law, a three-judge panel must unanimously decide to impose the death sentence.

Garcia, of Terre Haute, Indiana, was convicted Wednesday of first-degree murder in the 2008 stabbing deaths of the 11-year-old son of a Creighton University medical school doctor and the family’s housekeeper, as well as the 2013 killings of another Creighton doctor and that doctor’s wife. Prosecutors say Garcia was motivated by revenge over being fired by the doctors in 2001.