Powdered poison is discovered on Ikuro's doorknob and Serika's slippers, initially framing her for the crime.
This arc is notable for the early appearances of Masumi Sera , who continues to observe Conan’s detective skills. The Design of Poison and Mirage - Detective Conan Wiki
Ikuro Wakamatsu, age 25, who dies from cyanide poisoning after eating a piece of baumkuchen (cake).