A cause of death has been revealed for a paddleboarder who was killed in a Maine pond as police confirmed a teenager, 17, has been arrested in connection with the murder.

Early the next morning, authorities said they found her body near 100 Acre Island, a nature preserve in the middle of the pond. An autopsy later that day determined the 48-year-old woman’s death was a homicide.

A death of a woman whose body was found last week after going missing while paddleboarding in Maine is now considered a murder.