Democratic Rep. Carolyn McCarthy of Long Island is retiring.
She issued a statement saying she'll forever be grateful to her constituents for the privilege of representing them.
She said she plans to resume her role as a citizen activist for causes close to her heart.
McCarthy was elected in 1996 after her husband was killed and her son wounded in the 1993 Long Island Rail Road massacre.
She served nine terms in the House, where she has been a frequent advocate for gun control.
In June, she announced that she had been diagnosed with a treatable form of lung cancer.