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Detectives Eastridge and Porter were striking out. After driving halfway across the country, they were no further ahead. And things were looking dire when the oldest Briton, Sandra's son, also refused to speak with them. The detectives were clearly not getting what they needed on their own. So starting in late 2007, a grand jury was impaneled. When a grand jury asked for testimony, you show up.

Detective Todd, although no longer on the case, was highly invested and recalled for me what went down.

Detective Todd, although no longer on the case, was highly invested and recalled for me what went down.

Detective Todd, although no longer on the case, was highly invested and recalled for me what went down.

This refusal to testify from the two eldest baffled me. I'd been told they were estranged from their mother. So why wouldn't they talk? Was it too painful to confront who their mother really was? Was it a primal sense of loyalty to her? Or was it something else? Here's Eastridge again.

This refusal to testify from the two eldest baffled me. I'd been told they were estranged from their mother. So why wouldn't they talk? Was it too painful to confront who their mother really was? Was it a primal sense of loyalty to her? Or was it something else? Here's Eastridge again.

This refusal to testify from the two eldest baffled me. I'd been told they were estranged from their mother. So why wouldn't they talk? Was it too painful to confront who their mother really was? Was it a primal sense of loyalty to her? Or was it something else? Here's Eastridge again.

Why would Britton be afraid? Detective Eastridge told me he thought Sandra's son didn't talk because he was in some way involved. Somehow culpable. I'd play you the tape, but sometimes he can be hard to understand given what he's dealing with living with ALS. But hearing this from Eastridge got me thinking. When Detective Todd began looking into Sandra's past, she also reached out to the kids.

Why would Britton be afraid? Detective Eastridge told me he thought Sandra's son didn't talk because he was in some way involved. Somehow culpable. I'd play you the tape, but sometimes he can be hard to understand given what he's dealing with living with ALS. But hearing this from Eastridge got me thinking. When Detective Todd began looking into Sandra's past, she also reached out to the kids.

Why would Britton be afraid? Detective Eastridge told me he thought Sandra's son didn't talk because he was in some way involved. Somehow culpable. I'd play you the tape, but sometimes he can be hard to understand given what he's dealing with living with ALS. But hearing this from Eastridge got me thinking. When Detective Todd began looking into Sandra's past, she also reached out to the kids.

I thought this was odd. Why would Britton need an attorney to speak about his mother's alleged crime? Then, Detective Todd shared something Emily told her.

I thought this was odd. Why would Britton need an attorney to speak about his mother's alleged crime? Then, Detective Todd shared something Emily told her.

I thought this was odd. Why would Britton need an attorney to speak about his mother's alleged crime? Then, Detective Todd shared something Emily told her.

Could Sandra have wanted it out for Alan from the start? Had she contemplated making his death look like a tragic mishap in open water? Suddenly, Britton lawyering up made a twisted kind of sense. Maybe this wasn't just about covering for his mother. Was he protecting himself?

Could Sandra have wanted it out for Alan from the start? Had she contemplated making his death look like a tragic mishap in open water? Suddenly, Britton lawyering up made a twisted kind of sense. Maybe this wasn't just about covering for his mother. Was he protecting himself?

Could Sandra have wanted it out for Alan from the start? Had she contemplated making his death look like a tragic mishap in open water? Suddenly, Britton lawyering up made a twisted kind of sense. Maybe this wasn't just about covering for his mother. Was he protecting himself?

In the winter of 1985, one of the working theories was Alan Rarick had been killed in Dallas, then transported to Oklahoma City. And remember, the driver's seat was pulled up in the Bronco for someone much shorter than him. Someone like Sandra. But if she had driven him there in the Bronco and left it, how in the hell did she get back to Dallas?

In the winter of 1985, one of the working theories was Alan Rarick had been killed in Dallas, then transported to Oklahoma City. And remember, the driver's seat was pulled up in the Bronco for someone much shorter than him. Someone like Sandra. But if she had driven him there in the Bronco and left it, how in the hell did she get back to Dallas?

In the winter of 1985, one of the working theories was Alan Rarick had been killed in Dallas, then transported to Oklahoma City. And remember, the driver's seat was pulled up in the Bronco for someone much shorter than him. Someone like Sandra. But if she had driven him there in the Bronco and left it, how in the hell did she get back to Dallas?

Detective Porter told me the initial investigators ruled out one form of travel.