Bill Doyle, a tireless 9/11 family advocate who lost his son in the attacks, died Thursday at his home in Ocala, Fla., his family said Saturday. He was 70.

The former Staten Islander fought for years to get the city to provide a proper burial for the unidentified remains of 1,100 World Trade Center victims, including his son Joseph, 25.

“When no one else was willing to come to the forefront, he stepped up on behalf of the 9/11 families,” son Billy said. “And that’s the way he got through his mourning.”