An armed robber has been convicted of murder for randomly targeting and killing a Georgia State University honor student who was just three months shy of graduation.

A Fulton County jury convicted Desmond Davis, 27, known as "Chicago," of murder, armed robbery, aggravated assault and weapons charges in the Aug. 8 murder of college senior Jameson Bush, 21, prosecutors announced Tuesday.

Davis and his accomplice, hiding behind face masks, burst into a home on Beckwith Street near the Atlanta University Center and ordered the victim, who was visiting a friend, to hand over his money. Bush complied, but Davis shot him anyway, blasting him with four shots from an AK-47 assault rifle.

After the victim collapsed, Davis stood over him and shot him three more times in the back.

Davis later bragged about his crimes. Upset by the brutality despite a lack of provocation, Superior Court Judge T. Jackson Bedford sentenced Davis to the maximum sentence of life in prison plus 30 years, to be served consecutively.

Davis' alleged accomplices, David Handy, 29, and 28-year-old Darius Morris, 28, have not yet been tried.

Davis's conviction was among three announced by Fulton County prosecutors. In the others:

• A Fulton jury convicted Lester Collier, 42, of malice murder for beating Ben Sullen Jr. to death over an argument involving a woman. The crime, the most serious type of murder under Georgia law, carries an automatic sentence of life in prison.

After a heated exchange, the victim turned to walk away, but Collier picked up a 4-foot metal pole and delivered the fatal blows, fracturing the victim's skull, according to a press release by prosecutors.

After the victim collapsed, Collier hit him some more, cracking his breastbone and puncturing his heart. Sullen died from internal bleeding.

In an unusual move for a defendant in a murder case, Collier took the witness stand and tried without success to convince jurors he acted in self defense.

• A Fulton jury convicted a 20-year-old man for an East Point murder on Halloween 2006.

Armed robber Alfred Williams and his accomplice, both wearing masks, shouted "trick or treat" as they burst through an apartment door and opened fire, prosecutors said.

Bakarry Bailey, 27, who had gone to the Club Candlewood Apartment Complex to visit a friend, died.

Two other men dove on the floor to dodge bullets.

When East Point Police eventually closed in on Williams, he was still carrying the murder weapon.

His alleged accomplice, Leon Robinson, 19, awaits trial.