A man has been charged with murdering his four-year-old daughter.
Carl Wheatley, 30, is due to appear at Hatfield Magistrates' Court today over the killing, Hertfordshire police said.
Alexa-Marie died in hospital after police were called to the family home in Queen Bee Court, Hatfield, at 9.30pm yesterday.
A post-mortem to establish the cause of death will take place on Monday, the force added.
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Armed police have carried out a raid apparently linked to Wednesday's deadly terror attack in Westminster.
Cheryl Grimmer vanished from inside a beach shower block in Wollongong, Australia, in 1970, when she was just three.
Pc Keith Palmer was on the front line and because of his actions, the Westminster attacker was unable to kill anyone else.