NILES, Mich. (AP) — The father of a 7-year-old southwestern Michigan boy who apparently accidentally fell into a pool and drowned was honored at a vigil.

The vigil was held Monday night at a baseball field in Niles for Ayden Smith, who played there as part of a youth league. Adam Smith of South Bend says his son was “just an angel.”

The Cass County sheriff’s office says the boy was at a home attending a birthday party in Milton Township on Saturday. The South Bend Tribune reports he was given CPR and taken by ambulance to a hospital in South Bend, where he later died.

Michigan State Police are investigating the death, but they haven’t released details about what happened because the investigation is ongoing.