Evidence can vary depending on the circumstances, the weather, and how long it has been hanging around.
Without solid connections between homicides, we may have the reverse problem of believing three local murders are the work of one serial killer when they may actually be the work of three!
In reality, serial killers are of average intelligence.
The most important issue for the killer is the ability to get a victim easily and successfully.
Serial killers are everywhere! Well, perhaps not in our neighborhood, but on our television screens, at the movie theatres, and in rows and rows of books at our local Borders or Barnes and Noble Booksellers.
Serial killers kill for the power and control they experience during the murders and for the added ego boost they get in the aftermath from community fears, media coverage, and the police investigations.
The one noticeable similarity with almost all serial killer victims is their short height and low weight.