Teresa Heinz Kerry, the wife of Secretary of State JOHN KERRY, is in critical condition after possibly suffering a seizure.

The 74-year-old heiress was struck down with an undisclosed medical condition.

“She was brought in, in critical but stable condition, and that is currently how … her condition still remains,” Noah Brown, public information officer for Nantucket Cottage Hospital, told the Boston Globe.

 “At this point, we are determining the next phase.”

Associated Press reported that family members saw her exhibiting symptoms consistent with some sort of seizure. She was still being evaluated by physicians on Monday morning, the person said.

Doctors have repeatedly treated Heinz Kerry for breast cancer in late 2009.

On Sunday, after 3:30 p.m., EMTs on Nantucket received a call requesting medical and dispatched an ambulance, Nantucket Police Lt. Jerry Adams said.

Heinz Kerry is the widow of former U.S. Sen. John Heinz and heir to the Heinz ketchup fortune. Heinz died in April 1991 when a helicopter collided with a plane over a schoolyard in  Pa. The senator was among seven people, including two children, who died in the crash.

Heinz Kerry and John Kerry married in 1995.

Kerry famously ran for president and his running mate was John Edwards in 2004.

UPDATED: MRS KERRY has been transferred to a Boston area hospital from Nantucket.