investigate the killing of a bangladesh i american blogger. ploits say murders hacked him to death as he walked in bangladesh's capital. they haven't identified any suspects yet but they say a fanatic group may be all hind the killing. is this having a chilling affect on writers there and people in general? >> reporter: there have been at least four writers who espoused an atheistic secular position in their writings who have been attacked in the past ten years in bangladesh. roy is the third to have been killed. we spoke with the forensic doctor who carried out his autopsy and gives you a sense of the savagery of the attack. the doctors saying that roy had