We present a preliminary systematic study of the missing (E_T)
spectrum in diphoton events for a CDF data sample of 85 pb^-1.  The event
selection cuts used are looser, but based on, the cuts used for the CDF
diphoton cross section measurement.  The event with the largest missing E_T is
the ee gamma gamma missing E_T candidate event.  The distribution shows no
other significant deviations from the background estimate.  This measurement
lays the groundwork for searches for new phenomenon involving diphotons and
missing E_T, as is predicted in some models which attempt to explain the CDF
ee gamma gamma missing E_T candidate event.