Awwwww, sheesh.  :(  *hugs*  I'm so sorry that 
happened to you -- it really does hurt worse 
when you don't get the chance to say goodbye.

Years ago, when I was away at college, my 
parents moved out of the house we'd lived in, 
and gave my childhood cat to the neighbors.  
Part of me has always desperately wondered what 
happened to that little guy... the rest 
absolutely does not want to know, just in case 
it was something bad.  That cat was my best 
friend for a lot of years, and I'd hate to think 
he ended up in the pound (or worse) when the 
neighbors got divorced and moved out (which I 
heard years later that they had).  Since I 
wasn't there, I never even got to give him one 
last skritch, and that still makes me sad when I 
think about it.  So I empathize with you 
completely.  :(  Maybe one of these days, when 
your lifestyle permits it, you too should stock 
up on squirmy little kittens and build some new 
happy-feline memories for yourself...?