13. The Opdahl House, Stockton, CA
January 1977, 15 year old Matthew Opdahl unexpectedly shot and killed his two older sisters in their upscale home in Stockton, California. Carol and Susan Opdahl were both shot multiple times. Matthew’s father, Dr. Darril Opdahl, was also shot and rushed to the hospital where he later died from his injuries. His mother, Patricia, was the only one to survive her injuries. No one could understand why the seemingly normal high school sophomore, who earned good grades and was involved in sports, would do such a thing.
It’s unclear what happened to Matthew Opdahl. There are no online records of whether or not he was charged as an adult or served any time in prison. His mother still lives in Stockton.