I won't go back too far, so just the last few that are fresh in my mind:
Male, 19 months. (Intact, cardiac arrest following lung cancer...had pneumonia previously as complication)
Female, about 28 months. (Spayed due to early uterine issues/bleeding. Congestive heart failure.)
Female, about 16 months. (Not spayed. This is a very sad one...she went completely insane when her sister died and became horrifically aggressive, self-injurious, and almost totally stopped eating. Sadly, I had her euthanized because...well...she CLEARLY wasn't happy and nothing I could do seemed to help. She'd been really weird and high strung before, but cagemate was her saving grace.)
Female, about 24 months. (Not spayed. Very, very rapid tumor growth. Surgery probably wouldn't have given her much more time. Spent some nice days together than then euthanized for her comfort considerations.
Female, about 9 months. (Not spayed. Sudden death with no symptoms of any sort. Didn't do a necropsy).
Male, 26 months. (Intact. Pervasive metastatic breast cancer. Did alternative homeopathic therapy which seemed to greatly slow spread and make him feel a LOT better...euthanized about 6 months after diagnosis when he seemed less comfortable).
Female, 26 months. (Unspayed...She had slow decline after a bad bout of pnemonia, even though it was successfully treated. She passed away quietly during the night without obvious signs of pulmonary distress).