Officers are trying to trace 30-year-old Flavio Tortore following the incident involving and Audi A8 and a Vauxhall Astra in Marscalls Lane on 26 April 2018.
The person in the Astra left the scene before emergency services arrived while the driver and passenger in the Audi were left with serious injuries and taken to hospital.
The man in his 40s was later discharged, while the woman remained in hospital in a medically induced coma with multiple fractures, including a broken neck and serious internal injuries for a month.
She said: “I am very grateful to the emergency services for everything they have been doing – to the police for making every effort to track down the other driver, and to the NHS for the wonderful care I had.
“As time goes on I realise that recovering from my injuries and the trauma is a slower process than I first anticipated, but with the help of my family and friends I am doing my best to put this all behind me.”
Tortore is last known to have been living in Romford and has links to Ilford.
Anyone who knows of his whereabouts is asked to call the Serious Collision Investigation Unit on 101, or email CollisionAppeal@essex.pnn.police.uk
Tags: Romford, Ilford, Warley