We present time series radio data of the type Ic supernova SN 2004C taken with the 
VLA from January 2004 through April 2009 at 4.9 GHz, 8.5 GHz, 15 GHz, and 22 
GHz. We also present 3 epochs of Chandra data taken 110, 170, and 1150 days after 
the initial explosion. We model our radio data for each epoch with a synchrotron self 
absorbed spectrum, and apply the dynamical model of Chevalier (1998) to infer the 
properties of the forward shock as well the the mass loss rate of the progenitor star 
prior to the explosion. We find an abnormally high mass loss rate for the star, $\sim 
7 * 10^{-4} M_\sun per yr. We further find that shortly before the explosion, the 
mass loss rate, while still high, was steadily weakening by a factor of a few in the 
final decade before the supernova explosion, implying that the rapid changes in the 
core of the progenitor star were being communicated to the surface and weakening 
the mass loss rate.