A 61-year-old woman was killed on Sunday morning after a man opened fire inside a crowded Ohio fitness center in what local authorities described as a domestic incident.

The victim, identified as Sharon Dorn of Stow, Ohio, was inside the Cuyahoga Falls Natatorium around 9:30 a.m. when 63-year-old Craig Alan Sipe entered the facility on Fourth Street and shot her, as reported by CBS affiliate WOIO .

Emergency medical services transported Dorn to Summa Akron City Hospital, where she died from her injuries shortly after arrival at 9:51 a.m.

Sipe, an Akron resident, surrendered to officers at the Cuyahoga Falls Police Department shortly after the attack occurred.

At his arraignment on Monday, Sipe pleaded not guilty to charges of aggravated murder, according to court records cited by WOIO.…