Police are describing the death of a four-year-old girl in Grimsby as "unexplained".
Poppy Widdison died at the weekend after being transferred from Grimsby to Sheffield Children's Hospital.
Two people have been arrested.
More top news
Longest cold spell of winter so far. Bitterly cold with further wintry showers, significant snowfall likely over hills
Demonstrators will gather in Lincoln this morning to protest against proposed cuts to the city's local fire service.
Jon Mitchell with tonight's weather