The events took place on Friday evening in Rotterdam, the netherlands.
A man, 41 years old, is suspected of having stabbed to death his daughter, aged 8 years.
Earlier in the evening, the father and his daughter had presented to the hospital Maasstad, before suddenly disappearing.
The police, alerted by hospital staff, visited the places, and set out in search of the father and his daughter.
A few hours later, the man returned to the hospital and said where was her daughter who was also in the hotel. When help have found, she was still alive but seriously injured.
The relief tried in vain to save her but she died a few minutes later of his injuries.
The forty-something woman, who is alleged to have stabbed, was arrested and placed in police custody.