Nassau police are investigating the death of an 82-year-old man found at the bottom of his backyard swimming pool in Old Westbury Sunday.

Police say Samuel Kirschman told his wife he was going to take a swim. According to police, when his wife went to get him for dinner, she found him at the bottom of the pool and called police. Kirschman was pronounced dead after an officer jumped into the pool to retrieve his body.

According to police, it is unclear if Kirschman drowned or if he died from a heart attack or other medical emergency.