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In this paper we study the fermion quasi-normal modes of a 4-dimensionalrotating black-hole using the WKB(J) (to third and sixth order) and the AIMsemi-analytic methods in the massless Dirac fermion sector. These semi-analyticapproximations are computed in a pedagogical manner with comparisons made tothe numerical values of the quasi-normal mode frequencies presented in theliterature. It was found that The WKB(J) method and AIM show good agreementwith direct numerical solutions for low values of the overtone number $n$ andangular quantum number l.

Fermion Quasi-normal modes of the Kerr Black-Hole