What is the most venomous bird?

Well according to this animal guy on T.V. it is the Double-Wattled Cassowary (http://nationalzoo.si.edu/Animals/Birds/Facts/FactSheets/fact-cassowary.cfm) . Also this person seems to agree http://www.pbase.com/image/70822934. I have not really seen any hard evidence of this but it was pointed out that it may be related to the famous Velociraptor.

Hard evidence for this is the fact that it is the only bird that has intentionally killed a human, there is more than one case of death.