in addition to steve chappelle waiting in the wings to testify, the d.a. thing extremely rare in a murder trial. a play-by-play of the crime courtesy of text messages between morgan and steve as it happened. >> we were like, holy smokes, there it is. it's right there. >> the detectives had discovered the trove of messages during their interrogation. when they pulled morgan's phone records, looking for steve. >> we knew the exact time of death. we knew how it happened. we were floored. >> the texts are chilling. four hours before the murder, morgan texts steve, we ready, she types? steve responds, yup. at the shop now. half hour before the murder, morgan asks steve about the poison snapple. he drinking it, he asks. steve writes back, yeah, kind of. really just waiting for him to bend over. i have a shovel in my hand. ha, ha. morgan's response, nice, babe. steve doesn't reply. morgan writes, you backing out? >> there's a gap there where nothing happens. she then gives him the final taunt. you backing out? when she says that, he texts back, it's done. get here