HUNTSVILLE (November 14, 2012)--Sex offender Ramon Torres Hernandez, 39, was executed Wednesday evening in Huntsville for the rape, robbery and murder of a 37-year-old San Antonio woman 11 years ago.

Hernandez was one of three people convicted in the murder of Rosa Maria Rosado who was grabbed and thrown into a car that Hernandez was driving when she wouldn't release her purse during a drive-by robbery at a San Antonio bus stop.

She was bound and gagged, and then taken to a motel where she was raped and killed.

She was later buried in a shallow grave in a wooded area.

Hernandez asked one of his co-defendants to buy the shovel used to dig the grave while the woman was still being raped, authorities said.

Hernandez was on parole at the time of his arrest in Rosado's death.

He also was a suspect in the slayings of three teenagers and a 12-year-old girl.

The U.S. Supreme Court refused last month to review his case, and the Texas Board of Pardons and Paroles refused his clemency request earlier this week.

The Texas Court of Criminal Appeals rejected a last-day effort Wednesday to block the execution.

Hernandez argued in his appeal that he had new evidence that the lawyers who represented him early in the appeals process were deficient.

His execution Wednesday evening in Huntsville was the 14th this year in Texas.

Another inmate, Preston Hughes, is scheduled to die Thursday for a double murder in Houston in 1988.