CHICAGO (CBS) — The man who asked repeatedly for a state investigation into the Sterigenics plant in Willowbrook was remembered Saturday at a vigil in Elmhurst.

Hundreds came out to honor Matt Haller, who died of stomach cancer in March. Saturday would have been his 46th birthday.

READ MORE: COVID Test Confusion After Suburban Family Believes They Got False Result from University Of Illinois SHIELD Program

Haller wanted everyone to see the pain he was going through, and he was featured in many of CBS 2’s exclusive investigations into ethylene oxide emissions in Willowbrook.

The Environmental Protection Agency ultimately put a seal order on the plant which sterilizes medical equipment.

READ MORE: Chicago God Star Families Memorial Lights Tree For Those Who Fallen Military And Their Families

Haller is survived by his wife Colleen and his son Cullen.

A GoFundMe page has been created to support the Haller family.

MORE NEWS: Jussie Smollett Trial: Defense Attorney Calls For Mistrial And Accuses Judge Of Lunging At Her; Judge Denies Claims And Motion

RELATED: