A judge convicts a former rescue squad worker of involuntary manslaughter for turning the defibrillator paddles on a co-worker as part of a prank, which turned deadly.

Joshua Philip Martin, 25, faces up to 10 years in prison when he is sentenced in March. Circuit Court Judge Michael Lee Moore said Monday he will likely order prison time.

Martin had been on the job just four days when he went through with the prank on June 1.

Courtney Hilton Rhoton told Martin not to touch her with the paddles, but moments later he placed the paddles on her head and chest and activated the machine.

The 23-year-old mother of two small children immediately went into cardiac arrest; her body stiffened then went limp. Rhoton never regained consciousness and died three days later. She had been an emergency medical technician for just one year.