One of the biggest capital punishment cases to come before the U.S. Supreme Court in a generation was put together largely by a young, fresh-out-of-law-school member of Kentucky's overworked and underpaid corps of public defenders.

David Barron, 29, filed an appeal on behalf of two Kentucky death row inmates, arguing that the three-drug cocktail used in lethal injections across the country can cause excruciating pain, and thus amounts to cruel and unusual punishment in violation of the Eighth Amendment to the Constitution.

After three years of long hours on Barron's part, the Supreme Court agreed to hear arguments in the case onJan. 7.

"I can't believe I've got a case before the Supreme Court and I'm not even 30 years old," Barron said.

This is the first time in more than a century that the high court will address the legality of a method of execution. Thirty-six states use lethal injection, and executions across the U.S. have come to a halt in the meantime.

Legal experts said the Kentucky case apparently got the attention of the high court because it arrived fully developed -- it went through a full-blown trial with more than 20 witnesses, who argued both sides of the question of whether inmates suffer extreme pain while immobilized, unable to cry out.

Death penalty proponent Kent Scheidegger, legal director of the Criminal Justice Legal Foundation, said the case gives the Supreme Court "a clear shot at the merits of the injection question."

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The shaggy-haired Barron -- a Billerica, Mass., native who received a law degree from Brooklyn Law School in 2003 -- can be found in his office at nearly all hours. His office is about the size of a walk-in closet and is so cluttered that Barron must move boxes and books for visitors to sit down.

Barron is a hardcore Boston Red Sox fan, papering his office door with pictures and headlines. He draws professional hope from the way the Red Sox finally won the World Series after 86 years of futility.

"There's something to be said about representing the people who society casts aside," Barron said. "They are the ones often left to fend for themselve