To see a serial killer in your dream represents fear and insecurity. If you dream of a famous serial killer, then consider the mo or characteristic of that killer and how it applies to your own life.
To dream that you are a serial killer indicates that your compulsions and habits are working against you. You need to put an end to some vicious cycle and cut out the negativity in your life.
Dreaming that a serial killer is killing off members of your family implies that you are feeling cut off from your family.