26/09/2026
๐ต๐ญ ๐ง๐๐ ๐ฅ๐ข๐ง๐ ๐ช๐๐๐ฆ๐ง๐๐๐๐๐ข๐ช๐๐ฅ ๐ช๐๐ข ๐ช๐๐ฆ ๐๐ข๐จ๐ก๐ ๐๐๐๐ ๐๐ก ๐ง๐๐ ๐ฃ๐๐ฆ๐๐ ๐ฅ๐๐ฉ๐๐ฅ
๐ ๐๐ฅ๐ ๐ช๐๐๐ฆ๐ข๐ก ๐๐๐จ๐ โ ๐ ๐๐ก๐๐๐, ๐ฎ๐ฌ๐ฌ๐ญ
In March 2001, a 19-year-old student from the University of Santo Tomas suddenly disappeared.
Just days later, his body was found in the Pasig Riverโwrapped in carpet, his hands and feet bound, and tape wrapped around his head.
The victim: Mark Welson Chua, a second-year Mechanical Engineering student and ROTC cadet officer.
Two months before he was killed, he had exposed allegations of corruption within the UST-ROTC.
His death became one of the most controversial cases linking ROTC to allegations of corruption and abuse within the program.
๐ง๐๐ ๐๐ซ๐ฃ๐ข๐ฆ๐
Along with fellow Engineering student Romulo Yumol, Chua became part of an exposรฉ concerning alleged money collections and other irregularities within the UST-ROTC.
Their allegations were published in The Varsitarian in early 2001.
Following this, an investigation into the ROTC unit was conducted, and the commandant, Maj. Demy Tejares, along with several personnel, was relieved of duty.
But only weeks later, Mark disappeared.
๐ ๐๐ฅ๐โ๐ฆ ๐๐๐ฆ๐ง ๐๐๐ฌ
On March 15, 2001, Chua was last seen at UST.
According to testimonies that became part of the trial, he was at the Department of Military Science and Tactics, or DMST, office with several ROTC cadets.
He never made it home.
When Markโs family began searching for him, an even more disturbing detail emerged: his cellphone was still being used, and a message claimed that he had been kidnapped and that a โฑ3 million ransom was being demanded.
But as the investigation continued, a deeper story emerged.
๐ง๐๐ ๐๐ข๐๐ฌ ๐๐ก ๐ง๐๐ ๐ฃ๐๐ฆ๐๐ ๐ฅ๐๐ฉ๐๐ฅ
On March 18, 2001, Markโs body was found in the Pasig River.
It was wrapped in a carpet. His hands and feet were bound, and tape was wrapped around his head.
He was identified through his dog tag.
During the trial, the prosecution presented the testimony of Franco Suelto, a former ROTC officer who became a state witness.
According to his testimony, he saw Mark bound inside the UST DMST office on the night of March 15.
He also said he saw Arnulfo Aparri Jr., Michael Von Rainard Manangbao, Eduardo Tabrilla and Paul Joseph Tan at different points in events connected to the concealment and disposal of the body.
๐ง๐๐ ๐๐ฉ๐๐๐๐ก๐๐ ๐๐ก๐ ๐๐๐ฆ๐ฃ๐ข๐ฆ๐๐ ๐ข๐ ๐ง๐๐ ๐๐ข๐๐ฌ
One of the important pieces of evidence in the case was the carpet used to wrap Markโs body.
According to prosecution evidence reported in court proceedings, after the body was placed inside the carpet, it was taken out of UST in a pickup truck.
Later, according to Sueltoโs testimony, the body was brought to a section of the Pasig River in Lawton and thrown into the river.
The details concerning the involvement of each accused became a matter of dispute during the trial, but in 2004, the Manila Regional Trial Court found Arnulfo Aparri Jr. responsible for Chuaโs murder.
๐ ๐ข๐ง๐๐ฉ๐ โ ๐ช๐๐๐ง ๐๐๐ ๐ง๐๐ ๐๐ข๐จ๐ฅ๐ง ๐ฆ๐๐ฌ?
The prosecution theory was that the killing was connected to what Chua had exposed about alleged corruption within the ROTC.
In the trial court decision reported by The Philippine Star, the judge said the killing was carried out out of vindictiveness and to stop the exposรฉ concerning alleged corruption in the ROTC.
It is important to note that this was the trial courtโs finding regarding motive, and allegations without clear evidence should not be added.
๐๐ฅ๐ฅ๐๐ฆ๐ง ๐๐ก๐ ๐ง๐ฅ๐๐๐
In 2002, the Manila Regional Trial Court issued warrants of arrest against Paul Joseph Tan, Michael Von Rainard Manangbao, Eduardo Tabrilla and Arnulfo Aparri Jr. after prosecutors found probable cause for the murder case.
Aparri surrendered to the NBI on February 9, 2002.
In 2004, he was sentenced by the Manila RTC to death for Chuaโs murder.
However, the death penalty was never carried out because it was abolished in 2006.
In 2007, the Court of Appeals upheld his conviction, and his sentence became life imprisonment without parole.
๐ช๐๐๐ง ๐๐๐ฃ๐ฃ๐๐ก๐๐ ๐ง๐ข ๐ง๐๐ ๐ข๐ง๐๐๐ฅ ๐๐๐๐จ๐ฆ๐๐?
Eduardo Tabrilla was eventually arrested and entered into a plea bargain with the court. In 2006, he was sentenced to 6 years and 1 day to 14 years of imprisonment after pleading guilty to homicide.
Meanwhile, The Varsitarian reported in 2007 that Paul Joseph Tan and Michael Von Rainard Manangbao remained at large, with warrants of arrest against them.
In a 2008 report, The Varsitarian also said that Markโs family continued searching for Tan and Manangbao, who were reportedly outside the country at the time.
Important clarification: I did not find a reliable recent public record confirming that Tan and Manangbao were later arrested or imprisoned. Therefore, we cannot state as a confirmed fact that they are โstill wanted as of 2026.โ What can be confirmed from the available reports is that they remained at large in the latest publicly reported developments I found concerning the case.
๐ง๐๐ ๐๐๐๐๐๐ฌ ๐ข๐ ๐ง๐๐ ๐๐๐ฆ๐
Mark Chuaโs death sparked widespread debate about ROTC, particularly concerning allegations of corruption, hazing and abuse within the system.
Later, Republic Act No. 9163, or the National Service Training Program Act of 2001, was passed, giving students other options aside from ROTC under the NSTP.
Mark Welson Chua was only 19 when he was killed.
His story began as that of a student who spoke out about things he believed were wrong.
It ended with his body being found in the Pasig River.
And more than two decades after his death, questions remain part of the history of the case about exactly what happened to everyone involvedโand whether all of the accused were eventually held accountable.
Mark Chua is no longer simply a name in an old case. He was a 19-year-old student whose death left questions that reached beyond the case itself and into the Philippine education and ROTC systems.
๐ฆ๐ผ๐๐ฟ๐ฐ๐ฒ๐:
1. The Philippine Star โ court findings, arrest warrants and trial evidence.
2. The Varsitarian โ Court of Appeals conviction and status of the co-accused.
3. The Varsitarian โ developments in the cases of Tabrilla, Tan and Manangbao.
