UNDATED (CNN) -- It has been more than three years since a California family vanished without a trace. Now, investigators say they've located the family's remains in the Mojave Desert.
Joseph McStay, his wife summer and their two children Gianni and Joseph Jr. mysteriously disappeared from the Fallbrook area around the beginning of February 2010.
Their car was found not long after close to the San Ysidro Port of entry and surveillance video showing what investigators believed to be the family crossing into Mexico.
Monday, the skeletal remains of four people were located in the remote desert area of Victorville inside and outside of two shallow graves.
Now, a source close to the McStay family confirms that some of the remains belong to Joseph and Summer McStay. Rick Baker, author of "No Goodbyes: The Mysterious Disappearance of the McStay Family" says, "It's terrifying to me and it's like a serious hit in the gut. I've traveled to a number of countries around the world looking for them with sightings we thought are pretty serious."
Baker has spent countless hours researching the McStay family and is now considered an expert on the case. He is perplexed though as to why someone would want to murder them. He says, "I've read thousands of their emails that went from 10 years prior to their disappearance to a couple of days when they disappeared - I never saw anything in any of those emails that would even hint that an entire family of four would be murdered, you know that they would be into something that would get all four killed."