There is also the 2017 case of Megan Hargan who killed her sister and mother and staged the scene to look like M/S. It was at first accepted and announced as such but in 2018 she was charged with murdering them both. LE said they knew pretty quickly that the scene was staged but kept quiet about it and continued to investigate.
https://www.google.com/amp/s/www.insideedition.com/woman-staged-mother-and-sisters-killings-look-murder-suicide-police-say-48362?amp
Thank you.