a few days later, corporal ronnie gaskins got a big surprise.l wanted to meet at her lawyer's office. she had something she wanted to say. >> take us inside that attorney's office with rachel. what was her demeanor? >> i remember her pulling up the waist basket next to her. she was afraid she was going to throw up and then we started asking her the questions that we thought she would answer. did she overdose at a party? i remember her face got really red. she glanced at us and said, we stabbed her. >> it wasn't an accident. it was a murder. and not only had rachel and sheila killed skylar. they had planned it for months. all the while looking and acting like best friends. as sheila and skylar do in this video. as part of the plan, rachel and sheila settled on the night of july 5th as the ideal time to kill skylar. >> earlier that day, rachel had obtained the shovel from her father's residence, put it in sheila's trunk, brought the clean clothes, cleaning supplies and according to rachel, sheila had provided the kitchen knives. >> they called sky