From WikiPilipinas: The Hip 'n Free Philippine Encyclopedia
Cesar Mancao is a former intelligence officer in the police force of the Philippines who, along with Michael Ray Aquino, became known for his alleged involvement in a highly publicized murder case concerning the death of publicist Bubby Dacer and his driver, Emmanuel Corbito on November 2001.
 Involvement in a Murder
In 2001, he and Michael Ray Aquino were charged in relation to the death of publicist Bubby Dacer and his driver, Emmanuel Corbito, in Indang, Cavite in 2000. Glenn Dumlao, a former PAOCTF officer, submmited an affidavit in June 2001, narrating how he was given an order by then chief of Presidential Anti-Organized Crime Task Force (PAOCTF) Panfilo Lacson through his officers, Michael Ray Aquino and Cesar Mancao, to place Dacer under surveillance in January 1999. The affidavit stated that Dumlao was ordered to rent a room at the Manila Hotel so he could break in Dacer’s office in the building and steal or destroy whatever documents he could find in the office. Dumlao's superiors, according to the statements, were after documents pertaining to BW Resources which was under investigation for insider trading and stock manipulation at the PSE. Dacer reportedly got hold of the documents when Tan engaged in his services at the height of the probe being conducted by PSE and SEC.
A year after Aquino was arrested for overstaying and espionage case in the United States in 2005, Mancao was arrested as a material witness against the former by the US government. However, he was released on bail. Aquino was said to be helping Leandro Aragoncillo, a Philippine-born security specialist at the White House, transmit classified United States documents regarding President Macapagal-Arroyo to her opponents in the Philippines, including both Estrada and current opposition leader Panfilo Lacson, who had been Aquino's superior in the police force. However, he was released on bail. Aquino pleaded guilty to unauthorized possession of US Department of Defense documents.
 Return to the Philippines
In November 22, 2008, the US Department of Justice approved the Philippine government’s request to extradite Aquino, Dumlao and Mancao to be tried for the murder of Dacer and Corbito. In June 2009, Cesar Mancao returned to the country to face the charges and become a state witness against the mastermind behind the killing.
- "Mancao to Identify Principal Player in Dacer-Corbito Murder." Accessed on June 13, 2009.
- "New Panel to Prove Dacer-Corbito Slay." Accessed on June 12, 2009.