Authorities say it was a heart attack that killed a man who died over the weekend while exploring a treacherous southern Indiana cave.
State conservation officers say a medical examiner made the ruling after an autopsy on 49-year-old Timothy McLain of Brownsburg.
McLain died Saturday evening while he was part of a group of eight cavers more than two miles into Blowing Hole Cave near Corydon.
Blowing Hole Cave is part of the Binkley Cave system about 25 miles west of Louisville, Ky. Officials say it is treacherous, with chest-deep waters and tight crevices.
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