Murder mystery

Teeeheeeeeee.....
I draw stuff like this after I chat with people.....
Well here we have it, a good old fashioned 'Who Dunnit.'
The victim is Izzi.

It was a dark and stormy night when she summoned her friends and family members for an unknown cause. When they all arrived they met in the parlor where Izzi's faithful butler, Nox, came to serve them. After waiting a long while for Izzi to show up, SoloZerker, a good friend of Izzi's, Suggested that they all go check on her. Her room was locked though when they arrived, and no matter how much Nox knocked, she wouldnt answer. ZeroX, the local constable and friend of Izzi, Felt something was wrong and knocked down the door. CiciHatter found Izzi's body lying at the foot of her bookshelf. CurlyQ, unable to feel a pulse in her dear friend, called immediantly for the local doctor. Cyphrus-Axis, seeing the bloodied knife next to the body, took pictures of the crime scene. Faladin-erz, knew that one of them there was the murderer and began to make a list of alibi's when all the lights flickered out.....

Who's the murderer I wonder.....?