The collision happened shortly before midday at junction 20, near Kings Langley.
Four vehicles were involved – a Citroen C3, a blue Nissan Qashqai, a silver BMW 318d M Sport and a white lorry.
A woman, aged in her eighties, sadly died as a result of her injuries.
Police re appealing for information and witnesses and dash cam footage. quoting ISR 290 of March 27
PC Neil Crosier, from the Bedfordshire, Cambridgeshire and Hertfordshire Road Policing Unit, said: “My thoughts are with the woman’s family who are being supported by specially-trained officers.
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