Takeo Saeki (in Japanese: 佐伯 剛雄 Saeki Takeo) is one of the main antagonists in the Ju-on saga and its remake series The Grudge. He was an illustrator and the husband of Kayako Saeki. He is the main cause for the curse in the saga as he is the one who murdered Kayako and Toshio.
After Takeo discovered Kayako was in love with Toshios teacher he murdered Kayako when she came home, then he killed Toshio along with his cat. After his rampage he was killed by Kayako's evil spirit and then haunted the house along with his family, killing everyone who enters.