ROSARIO, La Union: In the wake of the Teachers’ Day observance here Monday, a newly hired teacher at the Rosario Union Institute was shot dead by a motorcycle-riding assailant along the national highway here on Saturday. Rosario Chief of Police Insp. Ben Kimmayong identified the victim as 21-year-old- John Michael Dumangcao, single, a resident of Barangay Namonitan, Sto. Tomas, La Union. Dumangcao had just arrived from a basketball competition won by the team he was coaching when attacked. The police have yet to establish the motive and identity of the gunman.