Well, my biggest female rat passed away unexpectedly. I'm assuming last night some time. She's my female that had her last litter of 19 a few months ago. I held back one of her daughters and two of her sons.
I got Foxy from a Petsmart as a full grown adult about a year ago, so there's no telling how old she was exactly, so she could have just died of old age, although she appeared healthy up until she passed, had not slowed down or become lethargic.
I'm going to miss the old girl!