MANILA - A lawmaker is calling on Filipinos in Chicago and midwestern United States to help find one of the suspects in the fatal hazing of law freshman Horacio "Atio" Castillo III who had fled the Philippines.

Bagong Henerasyon Party-list Rep. Bernadette Herrera-Dy, author of House Bill No. 3467 or the Revised Anti-Hazing Law, is calling on Filipinos in the US to report any sighting of Ralph Trangia.

"Overseas Filipinos living in Chicago and the Midwestern states of the US should report to law enforcement authorities if and when they see the suspect in the hazing death of UST law student Horacio “Atio” Castillo III," she said in a statement Saturday.

The Bureau of Immigration earlier confirmed that Trangia, a primary suspect in Castillo's death, left for Taiwan last Tuesday, a day before the Department of Justice placed him and other members of the Aegis Jvris fraternity on an immigration lookout bulletin order.

On Friday, the Taipei Economic and Cultural Office (TECO) in Manila said Trangia only passed through Taiwan on a transit flight and took a connection to Chicago.

• READ: Taipei: Hazing suspect Trangia flew to Chicago

"It is their (Filipinos') civic duty to help seek justice for Atio Castillo and help US and Philippine law enforcement authorities find the suspect, Ralph Trangia," Herrera-Dy added.

The US midwest is home to a sizeable Filipino community, with at least 12,684 registered overseas voters for the 2016 Philippine elections, Herrera-Dy said citing data from the Philippine consulate in Chicago.

The lawmaker also urged the Department of Foreign Affairs to cancel the passports of all suspects in Castillo's death. Earlier, the Philippine National Police said it would make the same request concerning Trangia's passport.

"The movements of these suspects in the torturous hazing of Castillo must be severely curtailed so that they can be found and arrested," she said.

"They must not be allowed to elude arrest and prosecution to the fullest extent of our laws," she added.

Castillo, 22, died in fraternity hazing rites last weekend after suffering massive injuries. John Paul Solano, another fraternity member, rushed him to the Chinese General Hospital early Sunday but was declared dead upon arrival.

Investigation found that the vehicle used to bring Castillo to the hospital was registered to Trangia's father Antonio Trangia.

Solano meanwhile surrendered to authorities Friday and is currently under police custody. He said he was not present during Castillo's hazing rites and was merely called to give first aid to the neophyte when he was already "half dead."

Another member, whose name has been withheld, gave his statement to the National Bureau of Investigation (NBI) regarding Castillo's death Friday afternoon.

The DOJ has opened a hotline for information on Castillo's death.

• READ: DOJ launches 'Horacio Hotline' for info on fatal hazing