OMAHA, Neb. (AP) – Police say a Nebraska mom who disappeared last month with her son strangled the 10-year-old boy before strangling herself in the woods of an Iowa state park.

Council Bluffs police said Monday that 41-year-old Charlotte Schilling, of Plattsmouth, Neb. and her son, Owen, both died with plastic zip ties around their necks.

The Schillings were missing from May 10 until their bodies were found May 20 in Lake Manawa State Park, south of Council Bluffs in western Iowa, about 20 miles north of Plattsmouth.

Council Bluffs police say Charlotte Schilling tried to commit suicide with a plastic zip tie in November, but a family member intervened.

Friends told investigators that Schilling’s recent behavior was consistent with someone contemplating suicide.

If you know someone showing signs of suicide please call the Suicide Hotline at 1-800-Suicide