Pablo Glean, who was also head of the citys Business Permits and Licensing Office, will be buried today with full military honors at the Libingan ng mga Bayani in Fort Bonifacio.
Glean was an Army captain who saw action in Mindanao at the height of the Muslim insurgency in the 1970s. He was wounded several times and received medals for bravery.
The Philippine flag at City Hall has been flying at half-mast since Monday after Glean was killed by still unidentified men outside a gasoline station in Fort Bonifacio last Saturday.
City employees wore black ribbons and a 40-meter strip of black cloth was hung from the 17th floor of the 22-story new City Hall building.
Binay has vowed to bring Gleans murder to the attention of Amnesty International and other human rights bodies as another political killing under the Arroyo administration.
He countered statements alleging that a dispute over coup funds and personal vendetta were the possible motives for the killing.
These, Binay said, are part of an attempt to muddle the investigation, as he asked police investigators to look into the political angle.
"There is no other motive but politics. If the police really want to get to the bottom of this, then they should focus on Oplan Phoenix and Task Force Spider," he said, referring to "special operations" targeting Binay and the political opposition in Makati which Glean uncovered three weeks before he was killed.