A Texas man was executed Thursday for murdering his girlfriend’s 13-month-old daughter in what prosecutors described as a brutal, 30-hour “exorcism.”

Blaine Milam, 35, was convicted of killing 13-month-old Amora Carson in December 2008 after attempting to expel a demon from her body inside his trailer in Rusk County, east of Dallas, according to the Associated Press.

He was pronounced dead by lethal injection at 6:40 p.m. at the state penitentiary in Huntsville.

The Associated Press reported that prison officials said Milam appeared anxious when he arrived at the Huntsville Unit prison early Thursday afternoon, adding he said he had a headache. He was then placed into a small holding cell adjacent to the death chamber.

An execution chamber in a Texas prison.  (AP)

Carson was later convicted of capital murder and sentenced to life without parole.

His attorneys argued he should be spared, citing unreliable bite-mark evidence and questions about his intellectual disability. His execution was scheduled in 2019 and 2021 but delayed as courts reviewed those claims.

The Texas Court of Criminal Appeals ruled the execution should proceed, and the Board of Pardons and Paroles denied his clemency request.

The AP reported that Milam’s trial was moved to Montgomery County, more than 140 miles south, because of intense publicity.

Texas remains the nation’s leading death-penalty state.

Fox News Digital’s Christina Shaw and The Associated Press contributed to this report.