A nonprofit organization has announced a major donation to help pay off the mortgage on a slain Massachusetts police officer's family home.

Weymouth police Sgt. Michael Chesna, 42, was shot and killed Sunday in the line of duty.

>> On Boston25News.com: Weymouth police Officer Michael Chesna posthumously promoted to sergeant

The Stephen Siller Tunnel to Towers Foundation is providing the first $100,000 toward the mortgage and is challenging others to support the family through the initiative.

Any money raised exceeding the mortgage will go directly to Chesna's wife and two children.

>> On Boston25News.com: Court docs: Man stood over Weymouth officer and shot him 10 times

The foundation, established in memory of a fallen 9/11 firefighter, supports military and first responders who are killed in the line of duty. In addition to his service with the Weymouth Police Department, Chesna was also a military veteran who served in Iraq and Afghanistan.

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Frank Siller, chairman and CEO of the foundation, will join Weymouth police Chief Richard Grimes at the Weymouth Police Department at 3 p.m. Wednesday to make the official announcement.

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The city of Brookhaven's mayor and City Council last week decided to remove the colored panes of glass from the dome of Brookhaven's new City Centre after residents objected to the brightness of the colors, seen here Friday, June 27, 2025. (Reed Williams/AJC)

Credit: Reed Williams/AJC