Convicted murderer Derell Green will go to prison a 16-year-old boy without chance of parole until he’s in his mid-50s.

Circuit Judge J.C. Nicholson Jr. sentenced Green to 40 years in prison today, with credit for time served, for killing 17-year-old Larry Maybank last year. Green was only 14 at the time of the crime.

Addressing the court, Maybank’s mother tearfully asked Nicholson to keep Green locked up.

“He shot my son in the back as he was walking home,” Sakera Maybank-Rivers said. “Please don’t give him a chance to take someone else’s life.”

Testimony during Green’s trial revealed that the two boys had been in an altercation about a month before the attack. Attorneys said Maybank and other teenagers jumped Green, stealing a gold chain with a Jesus head charm.

Green attended Daniel Jenkins Academy, a North Charleston school for students with behavior problems. Maybank took classes through a special program on the same campus.

Both boys left the school on Bonds Avenue during an early dismissal around 12:30 p.m., and Green and his friends fell in behind Maybank and his buddy. Green’s friends turned back toward the school, and Green pulled out a .38-caliber revolver, prosecutors said.

One shot grazed Maybank, and one traveled into his upper back and through his lungs and the major vein and artery around his heart. He collapsed in the driveway of a nearby business, where police found him motionless with blood coming from his head and mouth.

A jury found Green guilty of murder a week ago. Tried as an adult, he faced a maximum sentence of life in prison.

Read more in Friday’s editions of The Post and Courier.