DELTA — Authorities say even though Billy Kissner pleaded guilty to killing his wife, an exact cause of death cannot be determined.

The Montrose Daily Press reports (http://tinyurl.com/luq8d33 ) Kissner pleaded guilty Wednesday to manslaughter in the 2010 death of Raelynn Kissner.

Raelynn Kissner was found dead near a hot tub in 2010. According to court documents, Billy Kissner told first responders that his wife had been drinking and that he found her face down in their hot tub. He said he had taken her out of the tub by the time help arrived.

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Information from: The Montrose Daily Press, http://www.montrosepress.com