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In this project, we will compute the form factors relevant for $B \to K^*(\toK \pi)\ell^+\ell^-$ decays. To map the finite-volume matrix elements computedon the lattice to the infinite-volume $B \to K \pi$ matrix elements, the $K\pi$ scattering amplitude needs to be determined using L\"uscher's method. Herewe present preliminary results from our calculations with $2+1$ flavors ofdynamical clover fermions. We extract the $P$-wave scattering phase shifts anddetermine the $K^*$ resonance mass and the $K^* K \pi$ coupling for twodifferent ensembles with pion masses of $317(2)$ and $178(2)$ MeV.

$K \pi$ scattering and the $K^*(892)$ resonance in 2+1 flavor QCD