I have to write a thesis statement for Johnny Cash report. it needs to have betrayal, choices/consequences and a man's death brings people...

You might want to incorporate how Cash's choices yielded consequences such as betrayal.  This experience helped him form a voice whereby after death, people were brought together through his music.  It will be a challenge to incoporate all of these concepts into one paper because there are two different elements of his life ongoing here:  1)  The choices he made in his life and 2)  The legacy after his life.  I think it can be done, but I would emphasize that we have two different set of circumstances happening here.  Perhaps, having a two sentenced thesis statement is the way to go.