Trace amounts of sperm DNA were found on a pair of pants recovered from the scene. Prosecution experts claim Byers' wounds were the results of a knife attack and that he had been purposely castrated by the murderer; defense experts claim the injuries were most likely the result of post-mortem animal predation. Police believed the boys were assaulted and killed at the location where they were found; critics argued that the assault, at least, was unlikely to have occurred at the creek.