05E06 - Christmas Carol

At Christmas-time, Scully and her Mom arrive in San Diego to visit her brother Bill and his wife Tara, who is expecting any day. She's no sooner arrived than Scully receives a phone from a stranger saying she needs help. She traces the call but arrives to find that the occupant has committed suicide. The caller sounded like her dead sister Melissa. When she sees the dead woman's little girl, Emily, she is convinced that she's Melissa's child. Birth records confirm that the young girl had been adopted and Scully's examination of the dead woman leads her to believe she was killed. Scully orders DNA tests that prove to be quite informative.