Short on leads other than Moreno's description of two Latinos aged roughly 14 and 19, a neighborhood beat officer passed along a rumor from the halls of South San Antonio High School, where Cantu was in ninth grade. A shop teacher reported that three kids had been involved in the robbery and murder and that students were saying Cantu had done the killing. Questioned just before his arrest, Garza identified Cantu, saying he "saw Ruben come running out of the house" according to a detective's notes. The key trial witness, however, was Juan Moreno, the shooting survivor, who repeatedly identified Ruben Cantu in court.