Tess Guerzon-Cabrera of the Rizal Park and Bridge Preservation Society said she is "heartbroken" after someone vandalized the monument and ripped out the bronze plaques that were bolted and glued to the rock below the bust.
"This is the ultimate disrespect to him and those who fought hard in naming the park after Dr Jose Rizal," Guerzon-Cabrera wrote on Facebook.
The park is located at Beacon Hill in Seattle is one of the only five parks in the United States named after Rizal.