Fiancé of murdered mom speaks out after being reunited with daughter

Shane Carey speaks out for the first time since he was reunited with his infant daughter Margot, after his fiancé Heidi Broussard disappeared just two weeks after she gave birth.
2:48 | 01/09/20

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Transcript for Fiancé of murdered mom speaks out after being reunited with daughter
Back now for our exclusive interview with the fiance of Heidi Broussard, the young mom whose newborn was stolen from her before being murdered last month. The little girl has been reunited with her dad who spoke with Kaylee Hartung in Austin, Texas. You are so beautiful. Yes, you are. Yes, you are. Reporter: This morning we're hearing from Heidi Broussard's fiance for the first time since he was reunited with their infant daughter Margot. I wish her mom was here. Reporter: Shane Carey faced the unimaginable. On December 12th his fiance, Heidi Broussard, disappeared just two weeks after giving birth. Also missing, their newborn. He pleaded for their return. Drop her off anywhere. I don't care. Just make sure she's safe and okay. The baby is okay. Feed the baby. She's only 2 weeks old. Reporter: After a week combing through clues, authorities found the 33-year-old mother dead, strangled to death in the trunk of this car. In a shocking twist, the car belonged to one of Broussard's best friends, magen fieramusca, the baby found inside her home unharmed. Heidi loved magen. I mean like they had a great relationship. Like I went over my head about a thousand times like I should have been there, I should have noticed something. Reporter: Fieramusca was present when Heidi gave birth to both of her children and even took part in the search for the missing mom. Their decades long friendship undeniable. She was -- she was a friend, you know. Like you would not suspect this at all. Like at all. Reporter: But police say fieramusca deceived them by allegedly faking her own pregnancy. How soon after you guys found out Heidi was pregnant do you remember hearing that magen was pregnant too? Oh, I think -- it was like pretty much at the same time magen said that she had the same date as Heidi. Reporter: You never questioned it. I never questioned it at all. Reporter: The 33-year-old was arrested December 20th and charged with kidnapping and tampering with evidence. Police say fieramusca plotted to steal the baby and pass it off as her own but one big question looms. Why? Why? Reporter: The now 6-month-old baby a community once searched for relentlessly finally back in the arms of her father. Hey, sweetie. Magen fieramusca is in jail here in Austin. She is due for her first court appearance next month. In the meantime, Shane tells us they're working to establish a foundation in Heidi's honor to support children and families who have suffered traumatic events. Guys. Boy, such a traumatic event.

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

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