A lawsuit has been filed by the parents of Thy Mitchell, accusing her late husband Matthew of plotting to kill her and her family. The lawsuit includes videos as evidence, which were reportedly recorded inside the family's River Oaks home. These videos were submitted by the parents as part of the lawsuit, and are said to have been recorded in the days leading up to the deaths.

The lawsuit accuses Matthew of planning the killings, but further details are not available in this brief summary. For more information on the lawsuit and the evidence submitted, readers can refer to the source, Houston Public Media.