steven davis , 57 , of milton , and his relatives are sure bulger killed his sister , debra davis , in 1981 , despite the jury returning a ` no finding ' verdict .
but ` black mass ' , the upcoming film starring johnny depp and dakota johnson , has already upset the families of some of bulger 's many victims ahead of its release in september .
following the release of the first black mass trailer this week , mr davis told the boston globe he and his family are upset and offended that people will be profiting from their tragedy .