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Recent detections of large amounts of dust in high redshift galaxies imply that Type II supernovae (SNe) may be important dust contributors. The dust in high-z galaxies must come from young, massive stars, so Type II SNe are one of the few possible sources. We propose to continue monitoring of four nearby Type II SNe: 2004et, 2007it, 2007oc, and 2007od, in order to study dust formation in the ejecta of Type II SNe. The three observational signatures of this dust formation include, a decrease in the continuum brightness in the visible, a developing infrared excess, and asymmetric, blue-shifted emission-line profiles. With Spitzer, we will be able to carefully study the IR emission, and put strong constraints on the dust mass and how the dust changes with time. The proposed observations will be combined with previous epochs of Spitzer data and coordinated, already approved Gemini and HST observations. We may …