Hardin County State District Judge Britt Plunk, 64, died Tuesday morning after being rushed to an area hospital.
Plunk had a kidney transplant in January 2010.
Plunk received a Bachelor of Science degree from Lamar University and then attended South Texas College of Law and was admitted to the bar in 1973.
He worked at a private practice until 1977, when he became an assistant district attorney in Hardin County.
In 1983, he was the county attorney and became a district judge in 1985.
Gov. Rick Perry will appoint a new judge for Hardin County's 356th district.
Broussard's in Silsbee is handling funeral arrangements.
In March, Plunk announced he was switching from the Democratic to Republican Party, joining more than half a dozen Hardin County leaders who'd decided to switch political parties.
In May 2006, Plunk received a public warning from the State Commission on Judicial Conduct for allegedly playing favorites with a lawyer who was the daughter of a longtime court employee.