A Forth Worth man set to die for the murder of a four-month-old boy and the boy’s father is out of appeals.

Texas is set to execute 61-year-old James Bigby by lethal injection Tuesday night.

Bigby killed 26-year-old Michael Trekell and his son on Christmas Eve in 1987.

He believed Trekell and two other men were conspiring against him in a workers compensation case.

Bigby will be the fourth Texas inmate executed this year.