As others have pointed out, space isn’t anything. In earth orbit it’s close enough to the sun so that anything in the sun will get very warm indeed (260-degrees C) while anything in the shade will cool to -100-degrees C (Still not absolute zero but cold enough).
So, if you’re going to implement your meat locker idea, be sure to stick the body where the sun don’t shine. Universe Today covers this in much greater detail, and even uses the ISS as an example.
The ISS maintains a particular orientation WRT the surface of the earth. ISTM you could keep the dead astronaut’s body positioned between the ISS and the earth, so that it would be shielded from direct sunlight for most of its transit between the earth and the sun (and of course it would be shielded from direct sunlight for most of its transit behind the earth).
If you kept the body in a spacesuit, the white exterior would minimize solar heating during the transition periods. In the end, the time-averaged temperature of the body would be much less than the arithmetic average of the equilibrium temperature in direct sunlight and the equilibrium temperature in shade, and it should also be fairly stable.
I would hope that they’d put them in a body bag tethered to the station. That way the body could later be retrieved and put in a capsule for return to earth. However personally if I was an astronaut and died on the job I would want my remains to burn up in the atmosphere during re-entry (and would let my next of kin know that).
Simplest approach would be to strap the body to the bottom of the spaceship (heat shield) for the return trip.
No need for that; just tie a single string between the reentry vehicle and the body; they’ll both arrive at the top of the atmosphere together.
What happens next is automatic and inevitable.
Shagnasty, let me guess: You won it as the second-place prize in a slogan-writing contest for a soap company, right?
Sounds like Chronos was reading Heinlein as a young’un.
It was a major award!