An escaped California inmate wanted for killing the leader of an elite Mexican police unit while on the run was arrested in Tijuana, Mexico.Cesar Hernandez, 34, was arrested Thursday by Mexico’s State Investigation Agency.Hernandez was wanted in connection with the shooting death of 33-year-old Abigail Esparza Reyes, the leader of the Mexican police unit known as the "Gringo Hunters," which aims to capture U.S. suspects who are fugitives in Mexico.ESCAPED CALIFORNIA PRISON INMATE CONVICTED OF MURDER KILLS POLICE COMMANDER IN MEXICO: REPORTEsparza Reyes was killed during a shootout on April 9 in Tijuana while the unit was attempting to arrest