going to testify or do this, bang, they wind up getting killed or disappearing or something. >> reporter: investigators say there are no signs of obvious trauma in rakes' death. some media reports have suggested suicide. davis isn't buying it. is there any way this could be suicide? >> 110% no. >> reporter: with no obvious trauma, investigators are now waiting to toxicology results to help explain what happened for a man's 30-year dream of testifying against bulger, was cut short by prosecutors just before he died. >> that i was susan candiotti reporting. thank you so much for that. let's talk about this. decades to tell the story you don't have to be oliver stone or a conspiracy theorist to suspect