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.

The 17-year-old suspect in the death of Maine paddleboarder Sunshine Stewart was charged with one count of murder on Friday.