AC360 Exclusive: Joseph McStay's father speaks out about Chase Merritt's arrest

For nearly five years, Patrick McStay has been living through an unimaginable nightmare. His son Joseph McStay, daughter-in-law and two young grandchildren disappeared. Just last year, their bodies were found in shallow graves in the Mojave Desert. There were few clues about what happened to the McStays and until last week, there were no arrests.

Now, Joseph's business partner Chase Merritt is charged with the murders. Patrick McStay spoke exclusively with Randi Kaye and said the moment he learned that a family friend is the main suspect felt "like a boulder falling on me."