MANCHESTER, N.H. —

New Hampshire State Police are investigating a woman's death in the Merrimack River late Sunday morning.

Officials said Claire Knowles, 67, of Concord, had been swimming after her tube when she suffered a medical event while returning to shore.

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Two good Samaritans tried to help before first responders arrived, but Knowles was pronounced dead at the scene.

The incident remains under investigation.

Anyone with information is asked to contact Marine Patrol Sgt. Nicholas Haroutunian at 603-293-2037 or Nicholas.M.Haroutunian@dos.nh.gov.

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