Hundreds of mourners joined a procession in Tarlac province, north of the Philippines' capital on Sunday, during what should have been a festive season.
They were there to bury a mother and son killed by an off-duty police officer.
52-year-old Sonya Gregorio and her 25-year old son Frank, were shot in the head during a heated argument on December 20 by police officer Jonel Nuezca.
The argument began after Frank set off a "boga", an improvised air cannon used to celebrate the New Year.
A video of the incident, shared online, has sparked outrage across the Philippines.
It was taken by a member of the Gregorio family and shows Sonya wrapping her arms around her son as the row intensifies, and Nuezca shooting her in the head before doing the same to Frank.
Nuezca shot Sonya again before fleeing the scene. He surrendered to police later that night and faces two counts of murder.
Avelina San Jose, a relative of the Gregorios, said the victims' family has forgiven Nuezca
but still hopes for justice.
Critics and rights groups say President Rodrigo Duterte's war on drugs has created a culture of police impunity. Police reject this.
The president has talked of killing criminals and issued promises to protect law enforcement.
Duterte has condemned the shooting, warning "There will be hell to pay" for rogue officers.