A serial killer nurse murdered four hospital patients by injecting air into their bloodstream.
William Davis could face Texas' death penalty after deliberately ending the lives of people recovering from heart surgery.
Prosecutor Chris Gatewood told the court that Davis "likes to kill people" and was "a serial killer… in the hospital".
A guilty verdict was returned at the Smith County court after a two-week trial and an hour of the jury's deliberation.
The murder spree ran from June 2017 and January 2018 during which hospital staff noticed four recovering patients suddenly take an unexpected turn.
John Lafferty, Ronald Clark, Christopher Greenway, and Joseph Kalina – suffered unexplained neurological problems and died.
The jury was told that Davis of Hallsville, had "intentionally killed his victims by injecting air in their arterial lines".
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."
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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".
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."
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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 of 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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