The 23-year-old mother found dead in Sheldon Lake in June drowned, the Larimer County Coroner's Office announced Wednesday.

The office previously ruled the death of Heather "Helena" Hoffmann a homicide, but had not provided further details about how she died. Hoffmann also suffered significant blunt force injuries, said Debbie Reisdorff, a spokeswoman for the Larimer County Coroner's Office.

Jeffrey Etheridge, a registered sex offender and self-described transient, has been arrested and charged with first-degree murder after deliberation in connection with Hoffmann's death. He also faces charges of felony kidnapping, felony sex assault and felony tampering with a deceased human body — as well as two violent sentence enhancers.

The charge of tampering with a deceased human body was the most recent charge added to the case, according to the Larimer County District Attorney's Office. The prosecution filed a motion July 21 to add the count, and Eighth Judicial District Judge Gregory Lammons granted the motion July 25.

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