A court martial in Texas acquitted a U.S. military nurse of murder Saturday after he was accused of giving lethal doses of painkillers to hasten the deaths of three terminally ill patients at the air force's largest hospital.

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Capt. Michael Fontana, in a 2007 police photo, was acquitted of murder Saturday in Texas. ((Bexar County Sheriff's Office/Associated Press))

Capt. Michael Fontana, wearing his air force uniform, showed no emotion as a military judge cleared him of three counts of murder, then collapsed into the arms of weeping family members inside a Lackland Air Force Base courtroom.

Military prosecutors had painted Fontana as a rogue and arrogant nurse who pumped patients full of fentanyl and morphine when they were not "dying quick enough."

They accused him of changing hospital records, trying to cover his tracks and chastising other nurses for not being aggressive enough in treating the end-of-life patients. They argued that Fontana knew the lethal effect of the dosages he was giving.

After the ruling, Fontana said he never second-guessed his treatment or dosages. "My intention the whole time was to take care of dying patients," he said. Fontana, 36, said he wants to return to nursing.

Seeing the verdict as a validation, Fontana said he hoped the ruling would serve as a lesson for others whose job is to make sure the terminally sick are comfortable. One doctor testified in the court martial that he worried the case would chill the use of painkillers on the gravely ill.

Elizabeth Higginbotham, Fontana's lawyer, said during closing arguments that a guilty verdict would open the "floodgates" for lawsuits against nurses when a dying patient dies.

Col. William Burd, the military judge, also acquitted Fontana on one count of conduct unbecoming an officer for altering medical records.

"We have great confidence in our military justice system and we believe a fair verdict was reached today," the 59th Medical Wing said in a statement.

The hospital said Fontana will now undergo a clinical competency evaluation to determine whether he can return to being an air force nurse at the Wilford Hall Medical Center. He continued working at Wilford Hall while awaiting trial, but he was stationed in the library.