A state inmate who claims to be a high-ranking member of a “highly known white supremacist group” pleaded guilty in federal court Tuesday to threatening the Mobile County district attorney with a “very horrible and painful death,” court records showed.

William Terry Holmes, who is serving a 20-year sentence for domestic violence and violating the state’s sex offender registry law at Kilby Correctional Facility in Montgomery County, pleaded guilty to mailing threatening communication to DA Keith Blackwood.

According to the agreement, Holmes sent a threatening letter to Blackwood’s office on March 19.

It stated: “i [sic] am personally writing you to inform you we know where you live. You and your family’s every move is being watched. As a high ranked [sic] member of a highly known white supremacist group, I’m lettingyou [sic] know now that one of my own M. Perez has been sentenced to the death penalty.”

The “M. Perez” Holmes was referring to, according to court records, is Marco Perez, who was convicted in early 2024 of the capital murder of Mobile Police Officer Sean Tuder.

“I’m gonna make damn sure you, your family and the judge suffer’s [sic] severe consequences,” the letter continued. “I promise you soon real soon you, your family and the judge will receive my death penalty and yalls lives will end in a very horrible and painful death. Don’t try me you will lose just like me ex-wife [redacted] who was buried alive [redacted] in lrvington.”

Holmes spoke to law enforcement on March 22 and admitted to sending the letter and suggested he had “associates” who were watching Blackwood, whom Holmes claimed “only had hours to live,” according to court documents.

Alabama prison records show Holmes will be eligible for parole on Aug. 1, 2026. He was sentenced to 20 years in state prison in March 2014.

His current prison term is his second stint in a state lockup.

In 1998, he was sentenced to 10 years in state prison on first-degree sexual abuse and second-degree criminal possession of a controlled substance.