This is a partial transcript of "The Big Story With John Gibson," July 19, 2007, that has been edited for clarity.

JOHN GIBSON, "BIG STORY" HOST: The "Big Scare": Police say he killed his ex-girlfriend, now he won't leave her parents alone. Juan Carlos Ramirez has been on the run since he allegedly brutally murdered the mother of his child on Christmas day. He's been calling April Caldwell's family ever since, sometimes once a week to say that he's sorry. Now the family is on the run from him. "Big Story" correspondent Douglas Kennedy spoke with Caldwell's mother today. He also has tape of some of those phone calls. Douglas?

DOUGLAS KENNEDY, "BIG STORY" CORRESPONDENT: Yeah, John, this is a tape that is truly disturbing and April's mom told me she's plain scared. She says Ramirez is emotional and unstable and she doesn't know what he'll do next.

(BEGIN VIDEOTAPE)

KENNEDY (VOICE-OVER): Police say he stabbed his 17-year-old girlfriend to death. Now he says he has remorse.

JUAN CARLOS RAMIREZ, KILLED HIS GIRLFRIEND: I'm sorry, baby. I'm sorry baby.

KENNEDY: It's a chilling phone conversation between an alleged killer and his victim's mother.

RAMIREZ: I love that girl, love you so much.

ANNA CALDWELL, MOTHER OF MURDERED GIRL: But if you loved her, how could you do that to her?

RAMIREZ: I love you.

KENNEDY: Last Christmas, police say Juan Carlos Ramirez murdered April Caldwell, the mother of his 2-year-old son, David, in this apartment complex in Greensboro, North Carolina. April's mother, Anna, says she tried to help her daughter.

CALDWELL: I found her laying out in the yard and he had a knife in her chest.

KENNEDY: In fact, police say he stab the young mother 17 times before fleeing. Ramirez has been on the lamb every since, but periodically calls April's parents in tears to say he's sorry.

CALDWELL: Do you know how much April loved you?

RAMIREZ: Juan isn't right. Juan is stupid.

KENNEDY: Police say Ramirez could either be in Mexico or could still around North Carolina. They say he should not be approached.

UNIDENTIFIED MALE: And this is a dangerous person. I mean, we really need to locate him.

KENNEDY: April's family says they're scared Ramirez may try to snatch David and have moved three times in the past six months. They say they're also concerned with how the 2-year-old will cope with his life.

CALDWELL: We're going to miss our baby girl, but David, in the long run, is the one who is going to have to pay because he don't have a mom or a dad, now.

(END VIDEOTAPE)

KENNEDY: Anna told me she believes Ramirez is in the United States and is looking to get David back. She says she doesn't let help out of her sight and she never goes out alone. She says she's living in fear, John, and she just wants Ramirez caught.

GIBSON: Can't they tell if these phone calls are coming from Mexico or from the United States?

KENNEDY: Some of them they could tell that they were coming from Mexico and they confirmed they were coming from Mexico. But all of the time he is talking about David and how David is doing, so Anna believes he is coming after her.

GIBSON: Douglas Kennedy, thank you.

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