A 13-year-old Montana boy drowned in a river Wednesday after saving his sister from the water during a tubing outing — with authorities recovering his body following day.

Ephraim Dayley went missing in the Clarks Fork River near Fromberg, Montana, and his body was recovered Thursday around 2 p.m. local time, the Carbon County Sheriff’s Office said.

Sheriff Josh McQuillam told MTN News that Dayley and his sister were tubing when the pair ran into trouble.

“She had fallen off the tube or was attempting to get off, kind of unclear, but at some point she did get off the tube, was struggling to get back on where he tried to save her,” McQuillam said.

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