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And i'm thinking, "what?" >> reporter: debra raced over there. >> you could see police cars blocking it off, fire engines. it was crazy. >> reporter: they wouldn't let you in? >> they said it was a crime scene. >> reporter: john meehan never regained consciousness. and four days later, dirty john was dead. right after the attack, newport beach detective rick henry found john's killer, terra, at the hospital, her dog still guarding her. >> and she told me the whole story. >> the whole story's a pretty complicated mess. >> yes. >> reporter: as doctors treated terra's wounds, detective henry bega...

Welcome back to "dateline." suspicions about their mother's new husband, john meehan, had driven debra newell's daughters to become amateur detectives. so far they had uncovered a hornet's nest of deception. not only had john lied about being a doctor, several women had restraining orders against him, and he had served time for multiple times. yet debra was still standing by her man. now a woman from john's past was about to tell an even more disturbing tale. was debra in danger? here's keith morrison with "the women & dirty john." >> reporter: who was this man who'd stolen debra's heart, this...

That your actions caused the death of a loved one and now you don't have them. i learned that from him. >> reporter: and the man debra once loved she now feared. that had to be a very, very strange feeling. >> very much, yes. scared for my life. >> reporter: and not just her own life. >> i was afraid he'd kill my mom. i was also afraid he would kill me or my sister or someone. >> reporter: after all, they'd ruined all his plans. in the summer of 2016 debra began staying, in secret, with her other daughter, hoping she was safe there. and then it was the night of august 19th. >> she came home an...

Debra. didn't wash with terra. sounded like a shaggy dog tale. >> at that time i had lots of suspicions. >> reporter: and that's when she and her sister decided to do some snooping. >> she bought these trackers for cars. and she went and put one on my mom's tesla. so she found out where john was going. >> reporter: where was he going? >> he was going to multiple doctors' offices. >> reporter: not so unusual, perhaps, for an anesthesiologist. but the sisters noticed something. >> he was there for not that long of time. >> reporter: not long enough to conduct any medical procedure, so what were ...

An incorrigible person here. >> yes, sir. you're dealing with an addict. a very smart, articulate addict. >> reporter: eventually, thanks to luken, john did jail time for stealing drugs in ohio and michigan. and tonia felt guilty, wondering if she'd missed warning signs. wondered what else john might have hidden from her. never thought about the clue. way back at the beginning. on her wedding video. >> and the groomsmen who'd had some drinks and have their arms around each other, and they're talking about how they met him. >> we're here to celebrate john. >> one of the groomsmen said -- >> joh...