Radical 78
Radical 78 or radical death meaning "death", "decay", "bad" or "vicious" is one of the 34 Kangxi radicals composed of 4 strokes.
In the Kangxi Dictionary, there are 231 characters to be found under this radical.
歹 is also the 67th indexing component in the Table of Indexing Chinese Character Components predominantly adopted by Simplified Chinese dictionaries published in mainland China, with being its associated indexing component.