This study uses the Weather Research and Forecasting model coupled with Chemistry (WRF-CHEM) as a cloud-resolving model to investigate the impacts of forest fire smoke on microphysical, dynamical, and radiative properties of DCCs. Our case study focuses on a DCC observed over northeast Colorado during the Deep Convective Clouds and Chemistry (DC3) field campaign on June 22nd, 2012. This case was quite unique as smoke from the High Park Fire was directly injected into a DCC. According to our observational data analysis, this forest fire indeed raised the aerosol concentration over the area, and some of the aerosols could act as cloud condensation nuclei. Comparing the WRF-CHEM simulations with and without forest fire smoke input, we found that the inclusion of the fire smoke changes the simulated microphysics of the DCC; especially graupel mixing ratio is quite different in the two runs. These microphysical differences lead to differences in dynamics and radiative properties of the cloud as well. We address physical mechanisms behind the differences between the two runs, which all stem from the differences in aerosol concentrations in the atmosphere.