Space Quest 1 VGA - Alternate Ending
It's not really a death, but... if you don't take the cartridge back out of the reader on Kerona, and you finish the game without it, you get a slightly different ending.
Important Guy: Roger Wilco, we, the people of Xenon, extend our limitless appreciation and eternal gratitude for your acts of heroism.
Important Guy: Now, if you'd only been smart enough to bring along the data cartridge containing the construction specifications, we'd be able to build a new Star Generator, thereby saving Xenon from the horrors of a rapidly cooling planet. Oh, well. You are just a janitor.
(The rest is the same as the usual ending.)