As 1113 English translation has arrived I guess it will be a good time to discuss about it. From what I believe I guess the people who called iori are not bad people and not from black organisation at least. I believe they are sent by PSB itself and most probably kuroda is behind them. The person who was killed was supposed to be killed by psb and is killed. It can also be that the victim took a beta blocker to stop his heartbeat and pulse. They are testing iori’s deduction ability and also how he can retrieve things. Heiji and Conan also seem to be involved in kuroda’s plan. The person we assume dead can be a psb agent consuming beta blocker or a real criminal which psb was after. Him using beta blocker makes more sense though.