  The acquisition of late-time imaging is an important step in the analysis of
pre-explosion observations of the progenitors of supernovae. We present
late-time HST ACS WFC observations of the sites of five Type IIP SNe: 1999ev,
2003gd, 2004A, 2005cs and 2006my. Observations were conducted using the F435W,
F555W and F814W filters. We confirm the progenitor identifications for SNe
2003gd, 2004A and 2005cs, through their disappearance. We find that a source
previously excluded as being the progenitor of SN 2006my has now disappeared.
The late-time observations of the site of SN 1999ev cast significant doubt over
the nature of the source previously identified as the progenitor in
pre-explosion WFPC2 images. The use of image subtraction techniques yields
improved precision over photometry conducted on just the pre-explosion images
alone. In particular, we note the increased depth of detection limits derived
on pre-explosion frames in conjunction with late-time images. We use SED
fitting techniques to explore the effect of different reddening components
towards the progenitors. For SNe 2003gd and 2005cs, the pre-explosion
observations are sufficiently constraining that only limited amounts of dust
(either interstellar or circumstellar) are permitted. Assuming only a Galactic
reddening law, we determine the initial masses for the progenitors of SNe
2003gd, 2004A, 2005cs and 2006my of 8.4+/-2.0, 12.0+/-2.1, 9.5(+3.4,-2.2) and
9.8+/-1.7Msun, respectively.
