Slipknot want Paul Gray's doctor to ''pay for what he has done''.

The group are ''in a state of anger and sadness'' following the news Dr. Daniel Baldi has been charged with the involuntary manslaughter of the bassist - who had battled addiction for many years and died of an accidental overdose in June 2010 - and have vowed to do all they can to help the investigation, with the medic also being probed over the deaths of seven other patients.

They wrote in a statement: ''As the loss of our brother Paul Gray is still very fresh for us in the Slipknot family, this new development has us all in a state of anger and sadness. The fact that this person took advantage of our brother's illness while he was in a position to help others has outraged everyone in our family.

''We can only Hope that Justice will be served so this can never happen to anyone else ever again! Our thoughts go out to the families of the other victims. We plan to cooperate as much as we possibly can to ensure this tragedy is never repeated, and to make sure this man pays for what he has done.''

If Baldi is convicted of all the charges, he could face up to 16 years in jail.

His lawyer Guy Cook, has called the charges ''unprecedented'', saying: ''It is unprecedented to turn unfortunate deaths or medical results into a crime against a doctor.''