Dear Shiela: You never know...Tiger may have missed Tippper and since he was getting up there in years (his kidneys could have been going downhill for some time...they will keep functioning even when 70-80% compromised) and he may have decided to go be with Tipper and look out for him like a loving "big brother" would. Tiger lived a good long life for an FeLV+ kitty -- longer than most -- which is a testament to the love and good care he received. I hope it can bring you some comfort to know they are together again on the other side.
Sally in San Jose