Growing questions about the killing of Heidi Broussard

The kidnapper, a close friend of Broussard, is now in jail but has not been charged with murder.
2:00 | 12/23/19

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Transcript for Growing questions about the killing of Heidi Broussard
And we have new reporting in the case of the Texas mother who disappeared with her baby. She was found dead in a trunk of a car, her baby found alive inside a home. Her friend is now charged with kidnapping. But tonight, no one has been charged with her murder. Kaylee Hartung has the story. Reporter: Tonight, growing questions about the killing of Heidi Broussard. The 33-year-old mother of two found strangled to death in the trunk of her close friend's car, nearly 200 miles from home. Magen fieramusca now in jail, charged with kidnapping Broussard and her newborn baby. But no one has been charged with her murder. A baby, believed to be Broussard's, found by police unharmed inside fieramusca's home. The arrest stunning Broussard's loved ones. One woman who says she's been friends with both women since they first met more than 20 years ago was live on a podcast when the news broke. That's Magan's house. Oh, my god. Oh, my god. What? What? That's magen, her best friend, that met her at church camp with me. Reporter: Caressa Nolte says fieramusca acted as if she was sick over Broussard's disappearance. Her and Heidi are best, best friends. She was there in the room when Heidi had Margot. Reporter: Fieramusca even offered to help in the search for Broussard. One of the search leaders expressing his shock at how fieramusca deceived him just days before her arrest. I can't believe how sincere she sounded. I was just scratching my head, trying to figure out how in the world could this person sound so convincing. Reporter: Police now investigating whether fieramusca was plotting to steal Broussard's baby after faking a pregnancy. Kaylee, the story is so sad. Child protective services still have the baby believed to be Margot in their custody? Reporter: That's right. The baby is in a foster home until DNA testing can confirm the child's identity. Officials hope to have the results tomorrow, and then they'll be able to determine the proper home for that newborn.

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

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