From the BBC:
A 14-year-old girl in the northern Nigerian state of Kano has confessed to killing the man she was forced to marry, police say. Wasilu Umar admitted killing her husband, who was more than twice her age, by concealing rat poison in his food, the police in Kano said. Three other people also died and 10 were taken to hospital apparently after eating the same food.
[...]The girl's father had forced her to marry the 35-year-old man, police said.