Tab Johnson (shown here) was already in jail for allegedly violating a protective order to keep him from the woman.
But sheriff's officials believe that didn't stop him from trying to hire a "hit man" to kill her, along with her boyfriend.
Fellow inmates took Johnson seriously and reported his intentions to jail officials.
Alford and Texas Rangers then devised a sting, with the sheriff posing as a killer willing to do the deed.
Now Johnson faces two counts of criminal solicitation -- murder.
Alford said the inmates did the right thing.
"They had a valid concern that [Johnson] was serious," the sheriff said. "So that just goes to show, even in jail, there is a little honor, yes, sir."