Police arrested Monday the main suspect in the February 11 killing of Cainta deputy police chief Senior Inspector Jimmy Senosin.
Authorities identified the suspect as Ruben Paglinawan.
Another suspect in the killing, Hermogenes Lachica, alias "Ekis," surrendered to the police last week.
Senosin succumbed to fatal gunshot wounds following a gunfight with armed men in Barangay San Andres, Cainta, Rizal last February 11.
The local government of Cainta in Rizal earlier offered a reward for anyone with vital information on the whereabouts of alias Ruben and alias Ekis.