A blue Volkswagen Crafter van was in collision with a stationary HGV on the A1089 Dock Approach Road from Tilbury towards the A13 shortly after 3.35pm.
Sadly a passenger in the van died at the scene.
He can be named as Douglas Edgar, 25, from Barton Seagrave, Kettering.
The van driver remains in hospital receiving treatment.
The driver of the HGV was arrested on suspicion of causing death by dangerous driving and has been released under investigation while we carry out further enquiries.
Any drivers who were in the area at the time and have dash cam footage of the incident or saw what happened are asked to contact the Serious Collision Investigation Unit on 101 or email CollisionAppeal@essex.pnn.police.uk, quoting incident 764 of 21 September.