I agree sad, WLK could very well be the murderer. His designation is a sexual predator, meaning he is considered a high risk of re-offending.
The reason I have a hard time believing Somer's killer is a sex offender, is because, according to the news reports, when her body was recovered she seems to have been fully clothed, since her clothing description was one of the initial identifying factors, including the birthmark on her leg. Also, when they first discovered her remains, LE couldn't make a statement regarding male or female child - they had to wait on the ME to arrive to make that determination so as not disturb any possible evidence on her clothing or body (the ME being the one who would have removed her clothing to determine male or female, I'm assuming).
I can't picture a sex offender sexually assaulting her, killing her, and then putting her clothes back on afterward, and then placing her in the trash. IMO, if she had been sexually assaulted, her body would have more than likely been placed in the trash without clothing, since most deceased victims of sexual assault are found unclothed. In addition, if WLK had sexually assaulted her and killed her, since he is now in custody, a DNA sample would have been collected from him (if they didn't already have it on file) and could have been matched to any DNA that would have been found on the victim as a result of a sexual assault.
Just so everyone knows why I lean away from a sex offender.