What happened to Vaako in Riddick?

Could you elaborate on the events surrounding Vaako's fate in the movie Riddick? I'm particularly interested in understanding the circumstances that led to his downfall and how it ties into the overall narrative of the film. Were there any significant actions or decisions made by Vaako that contributed to his eventual demise? And how did the other characters react to his fate? I'm looking for a detailed account that captures the essence of Vaako's story arc within the context of the movie.