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Officers are dispatched to the Cassias' home, and after getting a quick walk-through of the house, they ask Mark
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and Sierra to lay out their day in detail. Now, Mark says that he and Melissa left for work early that
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morning, as usual. And we're talking like early early. His shift starts at 6:30 in the morning. And And they live
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like over an hour away. >> Yeah, and Melissa was behind the wheel. And like she always did, she dropped him
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off at his building at around 6:15, and then she would drive to her building on campus and park her car there. But
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today, Mark reminded Melissa that he needed to run to the bank at 11:00, so she agreed to bring the car back to him
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then. Now, what he didn't know is that she turned around and went home. We know Sierra woke up at 7:45 to find her mom
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there, which surprised her. But when Sierra mentions that Melissa's excuse about like being home was like her
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forgotten badge, Mark says, "Wait, that that can't be right." He had watched Melissa hand her badge to security at
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the guard shack himself when they got to the lab that morning. Mark says that he
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started calling and texting Melissa at around 10:45, but he wasn't getting anything back, which he says concerned
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him cuz >> [music] >> A, they normally talk throughout the day. B, more than needing to go to the
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bank at 11:00, like she was his ride home, but she seemed to be MIA. So, he eventually asked Sierra to pass
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along a question to her mom. Should he just find another ride home? >> And did they often communicate through
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Sierra like that? >> No, never. So, that stood out, even if she didn't think too much of it at the
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time, but like now it does. And so, Sierra reaches out and she gets a response from her mom. Yes, tell him to
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find a ride home. That was at 1:33 p.m. Not too long after she'd stopped by to bring Sierra lunch.
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>> And why isn't she just answering Mark? This is a I couldn't tell you. >> I'd be pissed.