I am so sorry Katie. When I saw Demeter and I just knew you had suffered another loss. It always harder when it is one of the "special" ones.
I adore all my kitties to, but when Fletcher died it seemed like the world ceased to exist. He was just extra special, an old soul or something. It sounds like Demeter had the same affect on you.
I have a feeling your new beautiful boy Cronus is going to turn into another special one. Fletcher sent me Pumpkin.. I honestly believe the timing of Cronus finally getting to you and the loss of Demeter were not a coincidence.
Lots of love and grief healing thoughts coming your way.
RIP sweet Demeter, you have many friends waiting at the bridge.