A top Missouri prosecutor was found dead inside a county courthouse — reportedly killing himself inside the building months after saying the job brought him “considerable pain.”

Eric Zahnd, 53 — the longest-serving prosecutor in Platte County history  — was found dead inside Platte County Courthouse at around 2:15 p.m. Thursday, the local sheriff’s office confirmed, according to FOX 4.

The courthouse was immediately closed, and remained sealed Friday.

Officials have not released details about his death but sources told the local station KCMO that Zahnd took his own life inside the courthouse.

Platte County Prosecutor Eric Zahnd reportedly took his own life inside Platte County Courthouse — months after saying the job had “brought great joy to my life and also considerable pain along the way.” Platte County Prosecutor's Office

Zahnd, who has served as the county’s lead prosecuting attorney since 2002, played a key role in passing Jessica’s Law, which puts child rapists behind bars for life.

He was also central to numerous key cases in the state, including the shocking drug deaths of three Kansas City Chiefs fans found frozen to death in a garden after getting together for game night.

Zahnd had announced earlier this year that he was not seeking re-election, withdrawing from the primary minutes before the filing deadline — and making painfully clear the torment the job brought.

“Serving the people as their prosecutor has been my great privilege and solemn responsibility for more than two decades,” Zahnd said in April while announcing his plan to retire

“This job has brought great joy to my life and also considerable pain along the way,” he said, according to the Kansas City Star.

Missouri Attorney General Catherine Hanaway said she was “deeply saddened” to learn of Zahnd’s death.

“Eric was a true patriot, a person of remarkable character and integrity, and a public servant who cared deeply about his community,” Hanaway said in a statement.

“We are very grateful for his dedication to public safety, the rule of law, and Platte County. My thoughts and prayers are with his wife, Tracy, and sons, Benjamin and Luke, during this incredibly difficult time. We stand ready to assist the Platte County Prosecutor’s Office however they need.”

Zahnd (left) played a key role in passing of Jessica’s Law, which puts child rapists behind bars for life. Platte County Prosecutor's Office

Clay County Prosecutor Zachary Thompson called  Zahnd a passionate champion of justice.

“For over 2 decades, he sought justice for the citizens of Platte County with grit and integrity. My prayers are with his family and all those who cared about him as they navigate this difficult time,” he told the station.

Zahnd was named the state’s prosecutor of the year in 2014.

If you or someone you know is affected by any of the issues raised in this story, call the National Suicide Prevention Lifeline at 800-273-TALK (8255) or text Crisis Text Line at 741741.

If you are struggling with suicidal thoughts, you can dial the 24/7 National Suicide Prevention Hotline at 988 or go to SuicidePreventionLifeline.org.