A 51-year-old man was executed by lethal injection in the southwestern state of Texas on Tuesday for the February 1986 murder of a young sales clerk as he robbed a convenience store.
Michael Lynn Riley, 51, was pronounced dead at 2318 GMT, the Texas Department of Criminal Justice said in a statement.
In his last words Riley apologized profusely to the family of his victim. "I truly am sorry for the hurt and pain I caused you. I hope you can forgive me."
He also addressed his mother. "To my mom, I'm sorry. I love you. I'm not the big son that you wanted me to be. But, I love you."
Riley was sentenced to death for the murder of Wynona Lynn Harris, a 23-year-old woman he stabbed 31 times as he robbed a convenience store on February 1, 1986 in the town of Quitman, east of Dallas, where she worked as a clerk.
Later, on the day of the robbery, Riley went to the sheriff's office and said he knew something about the murder. He eventually led authorities to evidence including bloodstained coveralls with nearly USD 1,000 cash in a pocket hidden in a field close to Riley's house.
Riley "confessed to the crime," the office of Texas Attorney General Greg Abbott said in a statement.