EXCLUSIVE: Hear it! 'Dog the Bounty Hunter' co-star says he cried after finding out the mom he tried to help, lied about child's fatal illness. She's now charged with murder.

Olivia Gant's mother writes to "Dog the Bounty Hunter" co-star Bobby Brown about her terminally ill daughter and her siblings. Brown surprises the family with a memorable Christmas. When Olivia Gant dies, her mother blames it on medical issues. But now police charge the mother with murder, saying she faked the girl's illnesses for cash and attention.

Joining Nancy Grace to discuss the case:Bobby Brown: Denver Bail Bondsman who appeared on "Dog the Bounty Hunter" & helped the family of Olivia Gant  Sharon Liko: Denver AttorneyJeff Cortese: Former Special Agent FBIDr Bethany Marshall: Psychoanalyst  Karen Smith: Forensic Expert of Bare Bones Consulting  Levi Page: CrimeOnline reporter