  We present the first results on the third order corrections to on-shell form
factor (FF) of the Konishi operator in ${\cal N}=4$ supersymmetric Yang-Mills
theory using Feynman diagrammatic approach in modified dimensional reduction
($\overline {DR}$) scheme. We show that it satisfies KG equation in $\overline
{DR}$ scheme while the result obtained in four dimensional helicity (FDH)
scheme needs to be suitably modified not only to satisfy the KG equation but
also to get the correct ultraviolet (UV) anomalous dimensions. We find that the
cusp, soft and collinear anomalous dimensions obtained to third order are same
as those of the FF of the half-BPS operator confirming the universality of the
infrared (IR) structures of on-shell form factors. In addition, the highest
transcendental terms of the FF of Konishi operator are identical to those of
half-BPS operator indicating the probable existence of deeper structure of the
on-shell FF. We also confirm the UV anomalous dimensions of Konishi operator up
to third order providing a consistency check on the both UV and universal IR
structures in ${\cal N}=4$.
