MANILA- The passport of one of the primary suspects in the fatal hazing of University of Santo Tomas (UST) law freshman Horacio "Atio" Castillo III may be cancelled after he fled overseas.

Philippine National Police (PNP) chief Director General Ronald "Bato" dela Rosa on Thursday said the police would ask the Department of Foreign Affairs (DFA) to cancel the passport of Ralph Trangia, an officer of the Aegis Jvris fraternity tagged in Castillo's hazing death.

This after the Bureau of Immigration confirmed that Trangia left for Taiwan on board an Eva Air Flight BR262 at dawn on Tuesday, a day after news broke about Castillo's death.

"Ipapa-cancel namin 'yung kaniyang travel documents, 'yung kaniyang passport para magiging undocumented alien na siya sa Taiwan (We will have his travel documents and passport cancelled so that he will become an undocumented alien in Taiwan) and the Taiwan authorities will be forced to deliver him back to the Philippines," Dela Rosa told reporters.

DFA spokesperson Robespierre Bolivar said the agency is checking if it has received the PNP's request. He explained that an arrest warrant may serve as basis for the passport cancellation.

"If there is an arrest warrant, passport or travel document may also be cancelled based on that warrant," he said in a text message.

“If the bearer of the passport is overseas and his/her passport is cancelled, DFA issues instructions to our Embassies and Consulates General worldwide to confiscate the passport if it is presented to them. The bearer will be issued a travel document valid only for a one-way travel back to PH,” he said.

Castillo, 22, died of "massive injuries" after initiation rites of the UST-based fraternity late Saturday. His parents learned of his death before dawn Monday after his body was brought to the Chinese General Hospital in Manila.

• READ: UST student suffered 'extreme pain' in hazing, says dad

Initial reports said his body was found on a sidewalk in Balut, Tondo by one John Paul Solano, who then rushed him to the hospital.

Solano turned out to be a member of the same fraternity. He is now among primary suspects in the killing, and has been placed under an immigration lookout bulletin along with 15 other members of the fraternity, including Trangia.

• READ: Frat members linked to UST student's hazing death placed on immigration lookout list

Trangia slipped out of the country before the Department of Justice issued the lookout bulletin Wednesday.

The PNP chief urged those responsible for Castillo's death to surrender, saying he believes the suspects are not evil by nature as they are law students.

"Sana makonsiyensiya naman kayo. Alam kong hindi kayo masasamang tao. Hindi kayo mga kriminal. Siguro nadala lang kayo sa bugso ng damdamin at challenge of manhood diyan sa pag-join ng fraternity," he said.

The Aegis Jvris fraternity meanwhile made the assurance that its members allegedly involved in the fatal hazing are willing to cooperate in the investigation.

"Our steadfast efforts to convince our brods to submit themselves to investigation bore fruition as they express their willingness to appear and submit to investigation," Aegis Jvris said in a statement. -- with a report from Henry Atuelan, ABS-CBN News

• READ: Fratmen linked to hazing death ready to surface: Aegis Jvris