I do not believe this was just a random act, but I am now beginning to think it may have been a random first meeting, that she may have only been minimally aware of, if aware at all. I don't see this guy as likely to be sitting on a computer dating site for hours, looking for a hookup to attack, but I do see him as the type who, someone mentioned several days ago, may have spotted Naomi on her way to work, stopping for her daily energy drink at the convenience store, getting gas, or whatever. It is a time of morning that he perhaps would be used to being out, so that would not necessarily raise suspicions of those who knew him well. I could see him as the kind to "brush against" Naomi in line, and then try to make small talk. Perhaps she didn't respond, or perhaps she basically shrugged him off, and he decided he had been disrespected and was going to teach her a lesson. He may have followed her a time or two to figure out her routine, and then lay in wait, as he apparently has done before, and then he struck.
I do not see this monster confessing to anything, and I do not see a good ending to this, but I pray for guidance for those searching today, and hope that they can find her and take her home to her loved ones. JMO