(CNN) -- An Oklahoma death row inmate received a drug commonly used to euthanize animals Thursday because of a nationwide shortage of sodium thiopental, the drug usually used as the sedative in its three-drug execution cocktail. John David Duty was convicted and sentenced to die for strangling his 22-year-old cellmate, Curtis Wise, with shoe laces in 2001. At the time, he was serving three life sentences for rape, robbery and shooting with intent to kill from a 1978 conviction.