In 1987 a star in the Large Magellanic Cloud went supernova. Before and after images were taken by a variety of observatories. Here are two links to before and after images:

http://www.phys.unsw.edu.au/~mgb/aat050.gif (after is on the left, before on the right)

http://hea-www.harvard.edu/~wendy/SN1987a.html

Here is a link to a NASA press release of the image of the supernova as it appeared in 1994:

http://www.stsci.edu/EPA/PR/94/22.html