LACONIA, N.H. —

New Hampshire State Police are investigating after a woman drowned Monday in Laconia.

Witnesses said they saw Bonita Johnston, 73, of Laconia, swimming alone Monday evening in Opechee Bay. A few minutes later, they saw her floating face down in the water.

Two of the witnesses tried to revive Johnston but couldn't.

Investigators said an autopsy showed she had a medical event and then drowned, but no other information has been released.

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