JACKSONVILLE, Fla. -

A man found guilty of first-degree murder and armed robbery in the death of a teenage convenience store clerk was sentenced to death Monday.

In October, the jury that convicted Michael Yacob voted 10-2 to recommend the death penalty. The judge upheld their recommendation on the murder charge and also sentenced Yacob to life in prison on the robbery conviction.

Moussa Maida was working at his family's store in Arlington on May 4, 2008, when he was shot to death.

While police had good surveillance video of the crime, the robber was wearing a mask and could not be identified. But police said the gunman cut himself at the scene.

Nearly two years after the slaying, DNA from the blood left behind led investigators to Yacob, who was already serving a sentence in Florida prison on a conviction of aggravated assault and other charges from an altercation in November 2008 at a different convenience store.

During Yacob's trial, prosecutors presented the DNA evidence, then showed the surveillance video taken that night.

The robber ordered Maida to put money in a bag, then to get down on the floor. But when the gunman left with the money, Maida got up to activate a button to lock the robber out. That's when the gunman fired two shots through the glass, killing Maida.

"He points the weapon through the glass ... actually pointing in the victim's direction, and discharges a second time," Jacksonville Sheriff's Office Detective Alan Leavens testified.

Maida's family stepped out of the courtroom while the video was shown during the trial, but Yacob's family remained.

Maida, 19, had recently moved to the U.S. from Syria and was trying to save money to go to college.