You realize this a myth right?
The sheer mechanics of accomplishing this are daunting. First, there is the crista galli, a thick, smooth, triangular piece of bone that projects from the bone that forms the roof of the nasal cavity (cribriform plate). Though there are small openings in the cribiform plate which allow nerves to pass through, they are not large enough to allow a mass of splintered bone to enter the brain case, nor are they direct conduits to the brain.
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The deadliest thing of all this is the strike itself same as a strike to the temple can be deadly.
Now if you wanna strike someone with deadly intent you better aim for the Adam's apple.