Who murdered our Dad Charles Kusko?

Our dad was murdered and we are starting this campaign to try and figure out who did it.  My sister Kaitlin and I would have never thought this would be our lives, everything used to be normal but now everything is far from normal.  We are trying to raise money to increase the Crimestoppers reward so we can figure out who did this.  All money raised will go into an account that will increase the reward to gain anonymous tips, to try and figure out who killed him.  We know nothing will bring our dad back, however knowing that this person will never be able to do this to anyone else will give us a certain peace of mind.  We will be beyond thankful for any amount that you can give.