U.S. Rep. Sean Casten's 17-year-old daughter, Gwen, die

The teenager died Monday morning, his office confirmed, as it requested privacy for the family "during this heartbreaking time."

Illinois Rep. Sean Casten's 17-year-old daughter, Gwen, died Monday morning, his office confirmed.

In a short statement shared on Twitter on Monday night, his office said the lawmaker's "beloved daughter, Gwen (17) passed away."

"The Casten family requests privacy, and we will be issuing no further comment during this heartbreaking time," it said.

This morning, Congressman Casten’s beloved daughter, Gwen (17), passed away. The Casten family requests privacy, and we will be issuing no further comment during this heartbreaking time.

Casten's office did not provide any details on the cause of death.

The teenager had recently appeared in a campaign video supporting her father's bid for a third term in Congress.