Search for Dark Matter in Fourth Generation Quarks

We present a search for dark matter through the production of exotic 4th generation quarks t$'$ decaying via t$' \rightarrow$ t + X, where X is dark matter. We search the lepton+jets channel in data from the CDF experiment at the Tevatron collider, and require at least 4 jets and large missing transverse energy (100-150 GeV).