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.
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The former footballer died after being shot with a Taser outside his father's home
Detectives leading a criminal investigation into the disaster want to speak to 19 people seen on CCTV at the stadium that day.