in a fit u mean...shaking its body , with gills open , trying its best to jump out of the tank?

if thats the case...u had the good fortune of watching your fish in its dying act.
theres nothing u could do...things like this do happen.
cichlids do die off without any visiable reasons...if the other fish are uneffected...then just forget this case and carry on.

__________________
Everyone Has a Photographic Memory..........some just dont have film!