  We consider the pair production of vector-like down-type quarks in an $E_6$
motivated model, where each of the produced down-type vector-like quark decays
into an ordinary Standard Model light quark and a singlet scalar. Both the
vector-like quark and singlet scalar appear naturally in the $E_6$ model with
masses at the TeV scale with a favorable choice of symmetry breaking pattern.
We focus on the non-standard decay of the vector-like quark and the new scalar
which decays to two photons or two gluons. We analyze the signal for the
vector-like quark production in the $2\gamma+\geq2j$ channel and show how the
scalar and vector-like quark masses can be determined at the Large Hadron
Collider.
