Authorities say a woman whose body was found in a suburban Philadelphia park committed suicide.

The Delaware County coroner said Monday that 44-year-old Teresa Mastracola died from inhaling helium. Coroner Frederic Hellman listed the cause of death as chemical asphyxia.

Mastracola's body was found Saturday in a wooded area of Ridley Creek State Park. She had been reported missing about a week earlier.

Mastracola was an avid hiker and bicyclist from Millbourne who often frequented the park.