Heard this as an audio book a while back and loved it! A doctor wakes up early on a long space flight and realizes that there aren't enough rations to last the rest of the trip. Eventually, close to starvation, he wakes another crew member and kills and eats him... as time goes by he refines his methods and keeps the other crew members alive longer as he slowly harvests their flesh so that the meat stays 'fresh' longer... well written and truly creepy! Any help with finding this story is much appreciated!
The title is The Taste of Starlight, written by John R. Fultz.
A scientist is pre-maturely awoken from suspended animation aboard a spaceship due to cryo-pod failure. He quickly realizes he still has 16 months before the ship reaches the planet colony it was sent to resupply/help, but only has 3 months worth of food. He has to survive in order to install some ultra violet boost thingy on the target planet, because it orbits a red dwarf that doesn't emit sufficient light for the crops to grow. So he starts nibbling on his crewmates, naturally.
It must be this one, I was looking for it myself and stumbled across this on lightspeed magazine. It's a thrilling read, but Kristoffer Tabori also does a great job narrating the short story, which can be heard here on the Lightspeed website.