Why my hamster died?

My hamster died this morning. His body was all wet but he doesn t have the smells,he died in the spinner. He was perfectly fine last night but when I woke up he was dead, I cried. He was just one year s old. I put two mouse in this cage one is this hamster and one is a perfectly normal hamster. They were like brothers they don t fought. He become dad last week. Now he died. The babies doesn t have fathers. Personally I don t think is wet tail, but let me know what s your opinion about this :) !