A Maryland man will spend the rest of his days behind bars after he murdered an up-and-coming boxer over loud music, authorities say.

Nicholas Francis Giroux, 37, was sentenced Tuesday to life in prison plus 20 years for the murder of his neighbor, 27-year-old Isaiah Olugbemi, according to the Anne Arundel County State”s Attorney Office. Giroux pleaded guilty to first-degree murder and use of a firearm in a crime of violence in February.

Cops with the Anne Arundel County Police Department responded at around 9:44 p.m. to a shooting at a townhome on the 500 block of Meadowmist Way in Odenton, some 20 miles south of Baltimore. Cops found Olugbemi suffering from multiple gunshot wounds. He was rushed to a hospital where he was pronounced dead.

Surveillance video captured the shooting. It showed Giroux walking up to the victim and shooting him several times with a handgun. He then returned and fired three more shots, prosecutors said. He walked to his neighboring townhome before fleeing in a van.

Giroux had been beefing with Olugbemi and his family over loud music, prosecutors said. Roughly two weeks before the fatal encounter, Giroux confronted the victim over loud music when they were hosting a cookout. He allegedly pulled out a handgun but did not point it at anyone, so he was not arrested.

Cops later questioned Giroux about the shooting, and he confessed to the murder and showed officers where he stashed the gun he used. He shot the victim 14 times, according to Washington, D.C., affiliate WRC.

The defendant also reportedly accused Olugbemi’s family of selling drugs, saying he did the state a favor and “I still want my medal of honor.”

But any vigilante defense ultimately fell apart, thanks to Giroux’s jailhouse calls.

“This is what happens when you f— with my sleep schedule,” he said in one of the recorded calls that was played in court, per WRC. “You don’t wake up.”

Olugbemi was born in New York before moving to Maryland while he was in elementary school, his obituary said. He was on the football, wrestling and track teams in high school, graduating in 2015. Six years later he picked up another sport: boxing. He excelled, winning a Golden Gloves national championship in the 203-pound division in 2024 — just three weeks before his death.

“He was laser focused and poured his heart and soul into it; training three times daily with an eye and heart aimed to the absolute top,” his obituary said.

His brother Daniel Olugbemi told WRC that “the world lost a gem.”

“I can tell you that without any doubt. It’s the loss for the world, because Isaiah had so much to offer. And it was just cut short at the prime of his life,” he said.

The victim also was a dad.

“Mr. Olugbemi was a father and rising star in amateur boxing. This was a cruel and senseless murder that took the life of someone with great promise,” State’s Attorney Anne Colt Leitess said. “The callousness and lack of remorse on the part of this Defendant is really disturbing. He deserves this sentence.”