bedroom and an appalling scene. it was karlyn and her four-month-old daughter together. >> she was laying in the master bedroom, and a little girl was they thought initially also had been murdered. but it turns out that she was just sleeping alongside her mom. the baby was unharmed. >> the investigators began their search for clues with karlyn's body. >> she was laying on the floor near the crib. her pants and her underwear had been removed. >> did that suggest to you that there may have been a sexual assault? >> it's something that you have to consider. >> the crime scene investigation ramped up. css dusted for fingerprints and collected hair and dna samples. karlyn had been shot three times. ballistics experts traced the bullets'trajectories and recovered a bullet from the floor. they were able to narrow down the weapon to a few different models. >> the caliber of the