Wolcott's Fate

I've watched the series twice now, and am still wondering if Wolcott hanged himself, or was done in by Captain Turner. During the wedding ceremony montage he is seen writing a letter, at that point, presumably a letter of resignation to Hearst; then later Tolliver tells Hearst that he made Wolcott write a confession letter for him before he would clean up the Chez Amis murders (a lie for Hearst to pay Tolliver 5% of what his claims made); but then immediately following that Hearst sends Turner to see if the confession is true and we never see specifically what transpires between Turner and Wolcott. We see the rope snap on Wolcott and then moments later Turner looks at the dangling corpse from the thoroughfare. Did Wolcott commit suicide after having been cut off by Hearst (his friend/mentor/father-figure) or did Turner hang him in retribution for potentially embarrassing Hearst? Was the letter one of resignation or a suicide note?