One of my toms had to be put down 3 weeks ago. He was just 5 years old and seemed to be quite healthy until the last days of November. He probably had a kind of leukaemia or a very aggressive bacterial infection that prevented him from regenerating his red blood cells.
Since I didn't want my other tom to be alone all day while I'm at work I went to the animal shelter and gave another cat a new home for christmas last weekend. Following my tradition of keeping cats with chronical diseases (I used to have a diabetic, too) I chose one with a weak heart that needs medication each day. He may die even younger than the other one, but wtf, I am determined to give him some good years.