- Older brother of Michael McStay.
- Son-in-law of Blanche.
- Days after the discovery of the bodies, Joseph McStay's father said the San Diego Sheriffs Department investigation was faulty. He filed formal complaints in 2013.
- Had two dogs, Bear and Baby Bear.
- Brother-in-law of Erin McStay and Tracy Russell.
- Son of Patrick McStay and Susan Blake.
- In 2010, Joseph McStay (age 40), and his wife Summer (age 43), lived in Fallbrook, California, with their sons Gianni (age 4) and Joseph Jr. (age 3). Joseph managed a company that built decorative fountains, and Summer was a licensed real estate agent.
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