Fresno Murder Suspect Arrested at Mexico's Border

FRESNO, Calif. 18-year-old Jesus Melgarejo was taken into custody while trying to cross from Mexico into California. He had a warrant out for his arrest ... in connection to a homicide on March eighth.

Police say 18-year-old /*Antonio Lopez*/ was killed in a confrontation between rival tagging crews. A fight broke out and Lopez was shot dead.

Two other men have already been arrested, in addition to Melgarejo. Police are still looking for a fourth suspect -- 19-year-old Carlos Luna.