What do Piggy Simon and the littlelun have in common in chapter 1?

The littlun with the mulberry coloured birthmark on his face is not mentioned in chapter one. He is first referred to during the second meeting that Ralph calls, which occurs at the start of chapter 2. Later in the book Simon is killed in a frenzied attack when he is mistaken for the beast. Later still Piggy is killed when he is knocked off the causeway by a boulder sent crashing down towards him by Roger. The littlun with the mulberry coloured birthmark on his face is never seen again after the fire goes out of control, at the end of chapter 2. So, two of the boys are definitely dead and the other is presumably dead too, killed by the fire or by smoke.