According to you atheists it really doesn't matter does it?
Why would you think that? I highly value life--both my own and others.
Jessica lost her life as a biolical organism. We can impose the same fate on her killer. Whether either of them will have some form of existence after losing their biological life is not something we have any control over, nor does it properly serve as any justification for either believing or disbelieving in any sort of deity.
The idea that Jessica is an angel in heaven, and that her killer is suffering eternal torment in Hell, may be emotionally satisfying, but reality is what it is, and doesn't care what we may prefer.