Roswell police announced Friday that two men have been arrested in the Jan. 26 robbery and shooting death of Lydia Alvarado, owner of the Azteca grocery store.

David Alberto Perez-Luna, 31, of Salisbury Trail in Riverdale, and Samuel Armondo Boyce, 30, of Douglasville, each are charged with murder, armed robbery, false imprisonment and aggravated assault, according to Roswell police.

Both men are originally from Panama and are thought to be in the U.S. legally, said Roswell police Lt. James McGee.

Perez-Luna was arrested Wednesday at an immigration office in DeKalb County, McGee said. Boyce was charged with the Roswell offenses on July 1 and is who is being held in the Clayton County jail on unrelated charges, McGee said.

Police are continuing to search for a third suspect.

The investigation was helped by several leads and eye-witness accounts, McGee said.

"We had a lot of evidence at the scene, a lot of physical evidence," he said.

Alvarado, 39, was shot in the chest almost immediately after several assailants entered her store on Alpharetta Street, police said in January, after viewing video from the grocery surveillance camera.

She was in the back of the store, by the office, when the assailants entered at about 9 p.m., police said.

Alvarado, who had moved from the Chicago area to Roswell 15 years ago, was taken to North Fulton Regional Hospital, where she was pronounced dead.

Two other female store employees were bound but not seriously injured, police said. A male customer was beaten and robbed.