Will a Federal employee's health insurance continue to cover the surviving spouse after a death?

My grandfather retired from the Census Bureau in the 80's. Since then, he and my grandmother have both been on government provided health insurance (Blue Cross, Blue Shield) from his job. He died of a heart attack this weekend, and I am trying to figure out if my grandmother will still benefit from the same health insurance even though he is gone.

Any answers would save a lot of time and stress.

Thanks.

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