they say, "michelle ann mockbee, in our hearts. 1969-2012." >> that was your idea. >> yes. thing to remember her by. >> reporter: there was a sea of red each day, as michelle's family and supporters flowed into this northern kentucky courthouse where david dooley faced trial for her murder. >> on may the 29th, 2012, dan mockbee lost the love of his life. and two little girls lost their mom at the hands of a man who couldn't even keep his story straight from one day to the next. >> reporter: prosecutor linda tally smith began by telling the jurors they wouldn't hear about any smoking gun, but they would hear david dooley's own words which, she said, had made him the "last man standing" in the detectives' process of elimination. >> it was through this process, that the path kept turning back to one person. the defendant david dooley. >> reporter: the prosecutor explained that at thermo fisher, warehouse employees used hand-held scanners like this one on the job and the scanner data could help locate where employees were around the time of the murder. >> we were able to create,