LOS ANGELES -- “Jersey Shore” star Ronnie Ortiz-Magro will not be charged after an arrest on suspicion of domestic violence last month, authorities said Thursday.Los Angeles city attorney's spokesman Rob Wilcox said his office opted not to file charges against the 35-year-old Ortiz-Magro, but it will charge him with a probation violation from another domestic violence case.Ortiz-Magro pleaded no contest last year to domestic battery and resisting arrest.