Dr. Araide

The next large thing to be revealed takes place a year prior to current events.
Kudo Shinichi's first case is revealed to have taken place on an airplane. It is a flight to L.A to visit Kudo's parents, but when they arrived Kudo's mom had plane tickets to New York where Kudo and Ran get involved involved in an other important case.

Back at present time, while at a doctor's office for a check up, Kogoro, Ran and Conan are invited to stay for dinner. That's when they meet the doctor's son Araide Tomoaki. He is also a doctor but has been coaching the basketball team at Teitan high while the coach is out with an injury

That night his father is found killed after a power outage, in the bath tub. He was killed by electric shock from a razor being put in the bath tub. The trick was set up by Tomoaki's step mother but the housekeeper Hikaru unknowingly flipped the breaker switch that turned on the power that killed Yoshiteru (Tomoaki's father). So to protect Hikaru, they tell the police, upon Kogoro(Conan)'s suggestion, that she drugged her husband, put him in the tub with the razor, and attached it to a timer, and that the murder occurred at a slightly earlier time. But with out them realizing it Tomoaki was just outside the room where Kogoro was making his deductions and so aside from inspector Takagi, Kogoro, and the murderer herself, he is the only one that knows how his father was truly killed.