CHICAGO (STMW) -- A jury deliberated for about two hours Friday before finding a Logan Square man guilty of shooting and killing a promising college student at a Halloween party in 2009.

Narcisco Gatica, 21, had been on trial all week, accused of pulling the trigger of a TEC-9 semiautomatic and killing DePaul University student Francisco "Frankie" Valencia and wounding his friend and classmate Daisy Camacho early on Nov. 1, 2009, in Humboldt Park.

Jurors found him guilty of murder and aggravated battery with a firearm.

Valencia and Camacho were attending a costume party in the 1700 block of North Rockwell that some Manic Latin Disciples crashed.

Gatica fired out of anger after he and his fellow gang members were told to leave the party, Assistant State's Attorney Ray Brogan said. Surveillance cameras captured the shooting.

Identified by a neighbor and again by a gang member, Gatica gave a statement to police admitting he fired shots, trying to hit some other gang members. Prosecutors played key pieces of the videotape during their closing arguments Friday.

Valencia's mother and other relatives packed two benches of the courtroom; most cried when a photo of him taken at the morgue appeared on a video screen.

With his family sitting near him, Gatica did not appear to show any emotion during the arguments.

Assistant public defender Marijane Placek disputed it was Gatica who fired the shots, arguing his black hoodie with giant embroidery on the back would have shown up in the light on the surveillance video. None of the witnesses mentioned the large gold motif on the jacket she held up for jurors again and again.

She argued that Gatica was set up by his fellow gang members, who were angry he was trying to leave the gang. "When gang members become less useful, they get sacrificed," she said.

Gatica's codefendant, Berly "Billy" Valladares, 23, a self-admitted Maniac Latin Disciple, was sentenced in July to 70 years in prison for supplying the weapon.

 (Source: Sun-Times Media Wire © Chicago Sun-Times 2010. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)