Kitten Body on the Stair Case

Yesterday night, it was 1:20AM when i returned to my dormitory, i coincidently found a body of a kitten lying on the stair case of the first to second floor. it was white kitten. i don't know why it was dieing and i even don't know when. At the first glance, i think it is the kitten kept by my friend, but when i went to his room, the one he feeds ,still doing fine.