Detective Conan

While taking an afternoon stroll, Conan, Ran, and Kogoro find an unconscious bird in the middle of the road. After Conan picks it up, it awakens and flies away. Soon after that, they hear a woman screaming. They rush to the apartment building and see a woman coming down saying her husband is dead. When they get to the veranda they find a man (Dobashi-san) who claimed he just got into the room. Terasawa-san (A man who came in after Kogoro and co.) who claimed the deceased was a terrible man. All three have supsious alibis, and have a good motive to see him dead. Who really killed Imoto-san, and with what weapon?