Police described the fourth suspect as 30 to 35 years old, 57" in height, medium built and with brown complexion.
EPD director Chief Superintendent Charlemagne Alejandrino, said the police are working hard in their investigation and urged the family of the slain businessman not to lose hope.
Police released the cartographic sketches of the three other suspects hours after the ambush at the Pearl Plaza last March 16.
Umale was shot three times by three of the four suspects while walking toward the Pearl Plaza building, which he owned. Sandy Araneta