Search for mother and baby comes to a shocking discovery

33-year-old Heidi Broussard and her 1-month-old baby Margot Carey were found; the mother’s body was discovered in the trunk of a car, the infant was found unharmed in a Houston-area house.
2:20 | 12/21/19

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Transcript for Search for mother and baby comes to a shocking discovery
We turn next to the gruesome discovery in the search for a missing mother and her newborn police believe they've found the body of the mother in the trunk of a car. Her baby has been found alive. Was there a plot to steal the baby? Did another woman pretend to be here's Marcus Moore in Texas. Reporter: Tonight, the search for 33-year-old Heidi Broussard and her 1-month-old baby Margot Carey is over. The missing mother's body found more than 150 miles from home, in the trunk of a car at this house last night. Authorities raiding the house and inside, finding a 1-month-old unharmed. We were able to recover baby Margot and the baby seems to be in very good health. Reporter: Police arresting magen fieramusca, described by family as Broussard's close friend. She's now facing charges of kidnapping and tampering with a corpse. The 33-year-old, who appeared in court today on traffic charges, is being held on a $600,000 bond. We had all prayed that we would be able to find Heidi alive. But unfortunately we don't believe that to be the case. Reporter: Sources telling ABC news police are investigating whether it was a plot to take Broussard's baby. Authorities believe fieramusca was telling people she was pregnant and they're trying to figure out if that was true. Police are now looking at online baby registries apparently connected to the suspect. Broussard and her daughter vanished December 12th, last seen in this surveillance image, dropping off her 6-year-old son at an Austin school. Her fiance Shane Carey pleading for his family's safe return. I love you, Heidi. I love you, Margot. Reporter: From the beginning, Broussard's parents, certain their daughter didn't leave on her own. Do you feel like she left on her No, no, no. Reporter: Tonight baby Margot is with child protective services until authorities can confirm her identity through a DNA test. And things moved very quickly in this case. Detectives followed a number of leads including one that came late in the investigation. But David, just a day earlier, investigators tell us they were not at all confident they could solve this case quickly. David? Marcus, thank you. There are also late

This transcript has been automatically generated and may not be 100% accurate.

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