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Council Bluffs police have released the cause of death for a Nebraska woman and her 10-year-old son.

The Associated Press reports 41-year-old Charlotte Schilling strangled her son Owen with a plastic zip tie before killing herself the same way. Their bodies were found in the woods at Lake Manawa State Park on May 20th.

Schilling and her son had disappeared from Plattsmouth, Nebraska May 10th.

Police say Schilling tried to kill herself in November of 2011 but a family member was able to stop her.