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The man convicted of killing an Aspen socialite was found dead in his cell Thursday.

William Styler, 67, had pleaded guilty to second degree murder and was serving a 20 year prison sentence for the February 2014 death of Nancy Pfister.

Department of Corrections officials haven't released how Styler died, but an investigation is ongoing, according to NBC affiliate KUSA. However, Fremont County Coroner Randy Keller told the Aspen Daily News late Thursday that, "at this point, it looks like a suicide."

Styler, his wife Nancy and another woman, Katherine Carpenter, a friend and former personal assistant of Pfister, were initially charged with first-degree murder, conspiracy to commit murder, and being accessories after the fact in connection with Pfister’s death. All charges were later dropped against both women after Styler confessed to the crime. However, detectives have said the case is still under investigation.

After being informed of her husband's death, Nancy Styler released a statement saying, "I hope people will remember him for the man he once was before his physical and mental illness took over his life." Nancy is releasing a book about the case later this year.

The Stylers had been renting Pfister’s house in the months before her murder.

You can watch Dateline's full report on the case below.


While She Was Sleeping

Oct. 11, 201408:08