Genichirou Sakakibara

Genichirou Sakakibara (榊原 源一郎 Sakakibara Gen'ichirō) is is the doctor in charge of Yoshiko Mamiya.

Plot
It is revealed that Genichirou is the father of Yoshiko Mamiya and the one who stabbed Isshin Saitou after Yakumo Saitou's father asked him to. He was the doctor who did put Isshin in a brain sleep after checking Isshin's organs incompatibilities with his daughter's organs. Yakumo hated him for this crime, but Yakumo agreed to sign the transplant papers so Sakakibara's daughter can survive. Later, Sakakibara submitted himself to the police and confessed to his crime.