Well it has been a while since I played ME2 on the PC, but I quickly got to the end of the game where you infiltrate the collector's base and you have to choose someone to go through the thermal vent. Well I forgot all about the team members dying if you do not choose the correct one to go down the path (I chose Mordin when if Legion/Tali/Kasumi were to go through, they wouldn't get their head blown up by a rocket launcher at the end). So I stupidly chose Mordin and while I was going through the vents, I saved during the mission overwriting my previous save which was right before choosing the team members for the job.
While this wouldn't normally bother me, I have never finished the game with no one dying either due to finishing the game prematurely and not getting all the ship upgrades or by just throwing random people for the final mission positions, so I'm pretty disappointed now that Mordin is dead... So the question is, is there a way I can go back?