The Sasebo, Nagasaki Prefecture, teenager suspected of killing and dismembering her classmate will now face an additional count of attempting to murder her father, police said Tuesday.
The 16-year-old girl has admitted to striking her 52-year-old father on the head with a metal baseball bat while he was asleep in his home on March 2 last year, causing an injury that took two weeks to heal, according to the police.
They served the fresh arrest warrant on her Tuesday.
Investigators quoted the girl as saying that she intended to kill her father.
He committed suicide last October after the murder came to light and shocked the nation.
Prosecutors had been holding the girl at a medical facility for psychiatric evaluation since last August. The evaluation ended last Friday.
Based on psychiatric tests, the prosecutors believe the girl can be held criminally liable, according to investigators.
If she is sent to a family court, the prosecutors will consider recommending that her case merits criminal prosecution.
For serious crimes, a juvenile can be held criminally liable instead of being placed under supervision. In such cases, the minor faces trial in the same manner as an adult.