I think by last meal - KK meant that now on he will be breaking all ties with Sudhanshu, so he won't be having lunch/dinner/breakfast at Reddys. Sudhanshu ain't dying or we would've got spoilers till now.
Besides, as Hiya pointed out, KK didn't even confirm it once. Is he so blind and foolish to kill someone based on photographic evidence? No. I don't think so.
Sudhanshu is defo not dying so you needn't worry (we will never get that Riddhi leaving the house scene). As for revenge, Sid may soon uncover KK's innocence cause the SHARK is almost done with, so are the Reddys individually.
With level 1 par, enough of damage has been done and its time now for some revelations.