Josh Mankiewicz

The actual barrel that fired the fatal shots, Jonathan told his lawyer, was hidden in a chicken coop behind his house. along with a homemade silencer he'd fashioned out of a flashlight.

After years of professing his undying love for Sabrina and praying for God's help in keeping their secret, Jonathan Hearn prepared to turn on her. God's purpose, it seemed, had just become Jonathan's proffer. On the 3rd of January, 2017, talks between the defense and the prosecution team began at the sheriff's department.

For Jonathan Hearn, those meetings must have seemed heaven-sent, because finally he had an opportunity to confess his sins. which included at least two of the seven deadliest.

Jonathan told prosecutors and investigators he and Sabrina spent months plotting to kill Rob Lamone. In fact, he said, they had once conspired to poison him.

According to Jonathan, they settled on putting a fatal dose of arsenic in some banana pudding, Rob's favorite. Jonathan told investigators he had ordered the arsenic online, calculated the fatal dosage by weight, and then tested it.

Jonathan said he did not see the dog again after that. So a few days later, he made a family-sized batch of banana pudding with Nilla wafers for Sabrina's family. Then in a smaller Tupperware bowl, he said he put a single portion and he put the arsenic in that. Jonathan said he delivered the two pudding containers to Sabrina's house one day when Rob was at work.

You guys didn't know anything about the poisoning until Jonathan gave that to you. That's correct. Detective Randall Meyer. They actually ended up giving it to Rob. Yes. And then at the last minute, Sabrina got cold feet and told Rob not to eat it.

To back up his story, Jonathan told investigators that he stashed the leftover arsenic in the garage attached to his house, hidden in an empty paint can.

That was a key condition of the plea deal, says Clayton Campbell. Any evidence Jonathan helped investigators find

That night, Clayton Campbell went home and prayed that investigators would find everything Jonathan had told them was hidden in and around his home. After all, a couple of years had passed since Jonathan lived there.

With the blessing of Rob Lamone's family, the Kern County Prosecutor's Office told Clayton Campbell they would make a deal with Jonathan Hearn. In exchange for Jonathan's full cooperation in the case against Sabrina Lamone, the District Attorney would let Jonathan plead guilty to the lesser charge of manslaughter. Instead of a possible life without parole for murder,

Jonathan would receive a predetermined sentence of 25 years and four months in prison. Clayton Campbell felt good about that. Jonathan would be a free man around the time he turned 50. Considering what he'd been facing, that was good. Now, Campbell had to tell Jonathan's parents everything.

While Clayton Campbell was meeting with the Hearn family, Detective Randall Meyer and a team of investigators were just turning onto Ventura Boulevard in Camarillo. They were on their way to arrest Sabrina Limon again.

Deadly Mirage is a production of Dateline and NBC News. From NBC News Audio, sound mixing by Katie Lau. Bryson Barnes is head of audio production.

After the kids are in bed, some things happen that don't happen during the day, let's just say.

After the kids are in bed, some things happen that don't happen during the day, let's just say.

How you doing, Andrea?

How you doing, Andrea?

This is about some young couples living out in the California desert in 2014. This is a completely man-made community. This is an area that would not sustain life were it not for the intervention of modern technology and bringing water in from other places. So they live in this lush, green place that's known as Silver Lakes. And they are young couples with young kids.

This is about some young couples living out in the California desert in 2014. This is a completely man-made community. This is an area that would not sustain life were it not for the intervention of modern technology and bringing water in from other places. So they live in this lush, green place that's known as Silver Lakes. And they are young couples with young kids.