LionFish says.....
Yes, it can happen, however the chances are slim to nill. You aint got much to worry about as those suckers can take in a whole bunch of food. Although, by feeding so much you could cause some serious internal digestive problems. It isn't good to have a stomach ache but when it comes to lions it could be fatal. Keep an eye on him. I would hate to hear that he died. Does the lion look bad now? Is he showing signs of death like fading and breathing hard. Of course, it should be breathing hard for a little while as you stuffed it pretty good. Try to be more careful when feeding. I doubt it will die though. Just watch it and keep us posted.