Veronica Galang, of 85 San Roque St., Barangay Holy Spirit, a student at a nearby school, suffered a bullet wound in the eye and died on the spot.
The assailant was said to be her schoolmate. He was armed with a homemade shotgun and fled after the incident.
Police said the suspect shot the victim after she repeatedly defeated him in a video game and started teasing him about his "sub-par play."
Initial reports showed that the two were playing at a computer shop near the victims house in San Roque Street, Barangay Holy Spirit at about 9:30 p.m.
After they left the shop, the suspect reportedly flew into a rage and pulled out his firearm. He shot Galang once in the left eye. Elements of the Central Police District are now looking for the suspect.
Meanwhile, a 57-year-old barangay official was shot dead by a drunk colleague early yesterday morning in Quezon City even after he helped the latter get home safely after a drinking session.
The victim, Ernesto Madriaga, a member of the Civilian Volunteers Organization of Barangay Sauyo, suffered a gunshot wound in the body and was pronounced dead on arrival at the Quezon City General Hospital.
The suspect, who is still at-large, was identified as Rodel Inducta, 30, also a volunteer barangay tanod and a resident of Novaliches. Matthew Estabillo