LUBBOCK, Texas (AP) — The adopted mother of a 3-year-old Russian boy who died in Texas told authorities the boy was outside playing with his younger brother before she found him unresponsive, a sheriff said Wednesday.

Laura Shatto told deputies that she was inside the family's home outside of Odessa, Texas, on Jan. 21 and came out to find Max Alan Shatto on the ground, Ector County Sheriff Mark Donaldson said.

Deputies arrived at the home as the ambulance was leaving with Max, he said, and the boy was pronounced dead at the hospital a short time later. No one has been arrested in the case, authorities said.