Quite possible, but that is usually more of a slow lingering death due to malnutrition from lack of varied diet, rather than "overnight"
Unless they Brought in some disease or parasite with them...
What kind of "feeders"...?? What else has he been eating..??
You said "eating like a Hog"...sometimes they can "overeat", get an impaction (clog) and resultant bacterial decay will kill them...
Any "signs" on the fish...?? Bloating...Spots...Cloudy eye..Swimming funny (upside down/sideways)...Cuts..Scrapes...Brusies...??
Have you checked the water parameters...How about aggression/stress from tankmates...?
Unless he "choked" on a feeder, it's usually not a "fine one day/dead the next" kind of thing...
Anything else about the tank you can tell us...?