A woman convicted of starving, torturing and killing her girlfriend's 9-year-old son 10 years ago became the second woman to be executed in Texas on Wednesday.

Lisa Coleman, 38, was pronounced dead at 6:24 p.m. CDT, 12 minutes after receiving a lethal injection by Texas Department of Criminal officials, reports the Associated Press.

Coleman was convicted of killing Davontae Williams in an apartment that she shared with his mother, Marcella Williams, in North Texas.

When his body was discovered by paramedics in July 2004, he weighed 36 pounds, which is about half the size of a child his age.

During her trial, a pediatrician testified that the boy suffered from over 250 injuries, including burns from cigarettes or cigars, scars from ligatures, and a lack of food.

"There was not an inch on his body that not been bruised or scarred or injured," said prosecutor Dixie Bersano.

A Tarrant County jury sentenced Coleman to death in 2006, while Williams took a plea bargain and was handed life in prison.

Coleman became the ninth inmate to receive the death penalty in Texas this year and the 15th woman executed since 1976.

The U.S. Supreme Court rejected a last attempt for an appeal presented by her lawyer, John Stickels, who argued that his client and the mother used "mostly a misguided means of discipline" on the child. He also noted that the aggravated factor of kidnapping, which resulted in the charge against Coleman a capital murder case, was incorrect. Therefore, he said that the jury's conviction on that charge was also incorrect.

He added that Coleman was unfairly targeted because she was black and a lesbian. "The state singled Coleman out and figured some way to get her the death penalty because she was black, a lesbian and an easy target ... it was a slam dunk," said Stickels, according to The Guardian. "We are not asking for her to be released, we are just asking the state to be fair and follow the law."