1. Either Shamrock was supposed to kill someone today (by the way, the fact that he was lying under Kaito's door might suggest that he was going to him, or not?), but didn't have time to kill, because he himself was killed by N.L.
2. Or someone from the blocked group shot at night - Morning or Yashur.
Therefore, for now, probably NNV (No New Victim).
PS I liked the explanation about Yashur, but I haven't looked for it myself yet, so I don't want to "execute" JustLeons yet )))