  The vacuum solution of Einstein's theory of general relativity provides a
rotating metric with a ring singularity, which is covered by the inner and
outer horizons, and an ergo region. In this paper, we will discuss how
ghost-free, quadratic curvature, Infinite Derivative Gravity (IDG) may resolve
the ring singularity. In IDG the non-locality of the gravitational interaction
can smear out the delta-Dirac source distribution by making the metric
potential finite everywhere including at $r=0$. We show that the same feature
also holds for a rotating metric. We can resolve the ring singularity such that
no horizons are formed in the linear regime by smearing out a delta-source
distribution on a ring. We will also show that the Kerr-metric does not solve
the full non-linear equations of motion of ghost-free quadratic curvature IDG.
