A Georgia man was convicted Tuesday of killing a young black man in a gruesome 1983 cold case murder that was allegedly motivated by racial hatred.

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A Spalding County jury deliberated for about six hours before returning a verdict against Franklin Gebhardt. The 60-year-old defendant — labeled a racist by his own lawyer — will spend the rest of his life behind bars.

Judge Fletcher Sams sentenced Gebhardt to life in prison plus 20 years immediately after the decision was announced.

"Hopefully, sir, you have stabbed your last victim," Sams said.

Prosecutors said Gebhardt and his brother-in-law stabbed 23-year-old Timothy Coggins some 30 times then dragged his body behind a pickup truck, linked by a chain.

Coggins’ mutilated corpse was found along a rural road in the small Georgia community of Sunny Side, about an hour south of Atlanta.

Gebhardt showed no reaction as the decision was read. Members of Coggins’ family, who have been in the courtroom every day of the trial, sobbed. They hugged each other and prosecutor Marie Broder.

Security was heavy in the courtroom as the decision was announced.

Gebhardt’s lawyer said the state lacked physical evidence linking him to the crime and were reliant on testimony from opportunistic witnesses — six of whom are currently incarcerated — who only came forward in hopes of reducing their sentences.

But prosecutors said many of those witnesses provided information, attributed to Gebhardt, that only the killer would know.