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Going to see him again. i just -- i just knew. something told me i wasn't going to see him again. >> four years ago, patrick mcstay lost everything he loved. four years ago, his son, joseph, daughter-in-law somer, and their two little boys, 4-year-old geeiani, and 3-year-old joseph jr., vanished. >> i don't think they knew what was coming. i really don't. >> how did you find out that they had gone missing? >> friday i tried calling him, couldn't feget him. sunday i called and couldn't reach him. now i'm getting worried. >> worried since patrick says he rarely went a day without talking to his ...

Who killed the mcstay family? >> from day one, i just had this gut feeling that i was never going to see them again. i just, i just knew. something told me i wasn't going to see them again. >> four years ago patrick mcstay lost everything he loved. four years ago, his son joseph, daughter in law, summer, and their two little boys, 4-year-old gioni and 3-year-old joseph junior, vanished. >> i don't think they knew what was coming. i really don't. >> how did you find out that they had gone missing? >> friday, i tried calling him. couldn't get him. sunday i tried calling him, and i couldn't reach...

His friends and family that he had not been communicating on line or via phone and i couldn't get ahold of summer either. >> dan cavanaugh, who managed joseph's company's website, contacted patrick. >> my gut instinct was not really a good one. >> patrick called his younger son michael who lived near joseph. >> i need you to go down and check on your brother. again, i get, i'm too busy. >> i didn't want to overreact. we thought that maybe they did a little ten-day vaca. >> let me tell you something, if i could have jumped through the phone on the 9th, i would have. >> a potentially devastating...

>> with their permission, i grabbed his computer, what would be joey's computer, and the sd card. i got the pictures off, i got that download. then i had to put that back prior to them issuing the warrant. >> back in texas, patrick could hardly believe what's going on. >> the first thing i'm thinking is, you're going to destroy evidence. i was just stunned. >> certain items that might have been really key to the big mystery of why they left that house are gone. touched, moved, cleaned up. it's ridiculous! >> and as you'll see, more road blocks will soon hamper the investigation. coming up, mys...

They're like, do what you need to do. >> but cavanaugh didn't stop there. by summer 2011 when joseph was still missing, cavanaugh had sold joseph's business to an outside company. >> they weren't really looking to give me huge amounts of money, but they were like, we'll just come in, pay off whatever debts and things that the company has incurred and bring it current, and then you'll barely get paid any money. >> patrick was enraged when he found out. >> owned nothing of any part of any share of anything. >> we shared ownership from the beginning, starting the company 50-50. we basically had a...