HUNTSVILLE, Texas (AP) _ A serial killer who blamed uncontrollable ``pressures in my head'' for his crimes was executed by injection Monday for murdering three women during a nine-month period of 1987.

Daniel Lee Corwin, 40, of Temple, was condemned under the state's serial killer statute for raping, strangling and stabbing two women, and fatally stabbing a third as her 3-year-old daughter watched.

Corwin spent much of a lengthy final statement addressing six family members of his victims, who watched from a few feet away.

``I want to express my sorrow and regrets from the deepest part of my heart,'' he said. ``I'm sorry. I regret what happened and I want you to know that I'm sorry. I just ask and hope that sometime down the line that you can forgive me.''

Corwin was paroled after serving nine years of a 40-year sentence for aggravated rape, and was later sentenced to 99 years for raping a college student and slashing her throat. She survived and identified Corwin. In prison, he confessed to the three 1987 murders.

Corwin's parents testified that he suffered two severe cuts to his head when he was a child. Psychologists who interviewed him suggested he could have suffered brain damage that was not easily detectable.

Corwin told detectives the pressure in his head led to what he called ``tunnel vision'' that after a few days led to his need to commit violence.