You mean for the deaths of over 7,000 Iraqi civilians by US armed forces because of the invasion he started on false pretenses? Or are you thinking more about the roughly 300,000 Iraqis who died in that conflict? Or maybe you're thinking about 100+ Iraqis who died while in US detention centers, several of which resulted in actual homicide charges? Or perhaps you are deeply concerned about the distinction between murder and torture authorized by GWB?