Former D.C. councilman Jim Graham has died, according to the Council of D.C.

The council announced of his passing in a tweet Thursday saying, “We've just been told that former Ward 1 Councilmember Jim Graham has passed away. Our hearts go out to all who, like us, knew & loved him.”

Graham was the second openly gay member of the council.

According to our partners at the Washington Post, he was known as a bow-tied activist who led the Whitman-Walker Clinic during the AIDS epidemic, he became a force for tenant’s rights and constituent services in a fast-gentrifying city during his 16 years on the council.

Many are taking to Twitter in reaction to his death:

D.C. Mayor Muriel Bowser released the following statement about the passing of Jim Graham:

“Jim Graham embodied DC values. Jim was a fierce champion for Ward 1 and led the way in fighting to preserve and protect affordable housing in booming neighborhoods. He was also a tireless advocate for LBGTQ rights and access to health care. Jim welcomed all neighbors and showed us that DC’s diversity alone does not make us great, but instead our embrace and celebration of our diversity does. Today, as I fight to include more Washingtonians in the District’s prosperity, I do so on the shoulders of leaders like Jim who fought to prove that moving DC forward means leaving no residents behind.”