Alberto Medina Probable cause affidavits for the arrests of two suspects in the Alamo McDonald’s parking lot killing on Tuesday indicate the victim was threatened with murder or a beating prior to a fatal meeting there. Those documents identify the victim as Raul Cantu Jr. He was shot and killed at approximately 11:47 p.m. that day at the eatery at 1018 W. Frontage Road. Alamo police thus far have arrested three people: Jose Alberto Jimenez Jr.,…