Thought maybe Rev Tuttle looked good for it since he’s a big guy, then again, no scars and wouldn’t get himself dirty like that. But he knows the killer. The killer may have provided him with children for pleasure. The killer thinks Tuttle has some evidence to incriminate him, so does the B&Es to get the evidence, finds nothing, then forces Tuttle to take the overdose to avoid possibility that Tuttle will squeal. Also check Tuttle’s close associates for a lover, son, nephew or protégé who is a big guy with scars. Or for someone close with whom Tuttle was keeping mutual dirty secrets or someone funding Tuttle’s addiction to power and money.