A serial killer nurse has been convicted of intentionally murdering four patients by injecting them with air.

William Davis, who prosecutors say "likes to kill people", was found guilty of capital murder and could now face the death penalty.

After about an hour of deliberation, the jury reached its verdict in the trial of William Davis, 37, of Hallsville, after a case that lasted about two weeks.

At the court hearing prosecutor Chris Gatewood was reported to have said that Davis was 'a serial killer... in the hospital.'

It was said that all of the victims had been recovering from heart surgery between June 2017 and January 2018 before taking an unexpected turn.

Davis had denied the charges but was found guilty after a trial (

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The jury was told that Davis had 'intentionally killed his victims by injecting air in their arterial lines.'

Prosecutors said that the motive for the killings was 'simple' and was because 'he likes to kill people.'

KLTV reports that Mr Gatewood said: “There is a motive here for Will Davis. It’s simple. He likes to kill people. He enjoyed going into the rooms and injecting them with air. If you watch the video on Kalina, he set at the end of the hall and he watched those monitors and he waited. That’s because he liked it."

Smith County District Attorney Jacob Putman said: “He killed these four patients. He did it on purpose. He did it by injecting air into their arterial lines. There’s no other way."

Defending, Phillip Hayes, said that Davis had 'no reason to kill.'

Davis was fired from CHRISTUS Mother Frances Hospital (

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He said: "Wife, two kids, what would be the motive? Because none of these things add up. Are you trying to kill people or are you trying to save people because here we’re doing both."

After the guilty verdict his sentence will be considered and he could be given life in prison or even the death penalty.

David has been a nurse at Christus Trinity Mother Frances Louis and Peaches Owen Heart Hospital in Tyler, and caused the deaths of four people.

He was found guilty in the deaths of patients John Lafferty, Ronald Clark, Christopher Greenaway and Joseph Kalina.

The prosecution is seeking the death penalty in the case and the 'punishment phase', where jurors hear more testimony from witnesses, is set to begin on Wednesday morning.

People convicted of capital murder face either life in prison without parole or the death penalty.

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