All four suspects had motives, as Seamus McCree explained. It was means and opportunity that implicated the murderer.
Payton Olliver couldn't have done it -- our "artist" had her hands covered in shaving cream, which stickified everything she touched. The bourbon bottle had fingerprints, but no shaving cream, which that it hadn't been wiped down . . . which meant she couldn't have put the nuts in it.
Ray Vuss Wordum couldn't have done it -- at the time the dargon nuts were being stolen, he was being snatched by hotel security.
Fran Van Helsing couldn't have done it -- when the murder occurred, she was being evicted from the hotel by hotel security.
That leaves only Helen Bvtzchknn with means (the nuts), motive (getting banned from the EWW) and opportunity (right there in the bar).
When arrested, Helen said . . . well, nobody understood what she said because it made no sense. Regardless, justice was served!