The Journals of Maria Muñoz

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[Music] They're an island with the edges of your emergency. So, um, on the right-hand side, she's not breathing. You may have taken some pills. Okay, what is your address? [Music] When we get the alerts on, they say it's an overdose. They're saying that he's performing CPR. [Music] He's on his third, fourth, fifth cycle. [Music] And that's when it gets to the house. [Music] I'm Officer Gerevolo de la Cruz. I was the first officer on the scene. [Music] Hello. What's going on? Mel's subject shows up at the door, and he just turns around and darts into the residence. I can see him heading up the stairs. I just see his shadow from the light that's on. So I follow him. [Music] He's helping with giving CPR. He's wearing scrubs. So I believe he's a higher level of care than I can provide. And I ask him, "Do you want me to help? Do I help you?" And he, right away, relinquishes giving CPR. [Music] What does she take? I think when I was with him. She's been pretty depressed lately. I don't see any drugs. Usually when somebody overdoses on drugs, the pills are nearby, the needles nearby, the syringe, something's nearby, and nothing was. [Music] I'm probably at the scene within the next 30 to 45 minutes. I'm Sergeant Luis Mata Jr. I was the lead detective in the case. Then I start trying to get information from him. And I notice him not answering fully. And when I asked him, "Well, what's going on, Joel?" He goes, "Well, I live a very private life, and those questions are something that I don't want coming out." [Music]
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A young wife and mother dies unexpectedly with a strange mix of drugs in her system. Investigators turn to her journals for answers. "48 Hours" correspondent Erin Moriarty reports.