WILMINGTON (CBS) — A lasting memorial was dedicated Saturday to fallen MIT police officer Sean Collier who was killed by the Tsarnaev brothers after the Boston Marathon bombings in 2013.

A memorial stone was placed at Wilmington High School where Collier graduated from in 2004.

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The idea for the stone came from senior Joe Wilson, who raised money for the project. Wilson comes from a long line of police officers and felt the stone would be a fitting tribute to Collier.

“My father is a police officer in Cambridge, so I was very close to all the happenings in the Boston Marathon bombing,” Wilson said. “This was very personal to me.”

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MIT Police Officer Sean Collier’s memorial at Wilmington High School. (Photo Credit: WBZ-TV)

Wilson came up with the idea in his sophomore year and started a Go-Fund-Me page to raise money.

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The memorial is located in the high school’s courtyard.