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Agent Castrida lays out Matthew's motive for murder in clear terms. She writes that in October of 2020, when
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Sandra heard about Matthew's wife's pregnancy, she went to him with an ultimatum. She wouldn't expose their
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years-long sexual relationship, including the fact that it began when she was underage, and that they'd been
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meeting while Matthew was on duty, if he agreed to try and get her pregnant. When
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Sandra got pregnant, she started telling people about it, and that wasn't part of
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the deal. The affidavit actually puts forward that on January 20th, when that friend Jill called Stoughton PD and
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spilled the beans about Matthew and Sandra, causing that officer to question Matthew,
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that is the very moment that Matthew hatched a plan to kill her. And all those heart-to-hearts after
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that, Agent Castrida says were, quote, his attempt to appease Birchmore until he could kill her, end quote. And they
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have physical proof, they say. The FBI analyzed the data from the health app on Sandra's iPhone. Her last movements were
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recorded at 9:40 p.m. That is 3 minutes before Matthew was seen leaving her building. So, it's likely this data
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shows exactly when Sandra died, and Matthew was still inside the apartment.