Overview
- The driver in her 60s died in hospital Wednesday, a day after the Tuesday collision on White Hill near Mount Vernon Hospital, and police said her next of kin are being supported.
- Her mother, a passenger in her 90s, was pronounced dead at the scene after a silver Kia Picanto collided with a grey BMW 118i M Sport.
- Police arrested a 22-year-old man from Watford at the scene on suspicion of causing death by dangerous driving, drug-driving, and possession of cannabis.
- He has been released on police bail while the Bedfordshire, Cambridgeshire and Hertfordshire Serious Collision Investigation Unit continues inquiries under Operation Guelder.
- Detectives urged witnesses to upload dashcam video via the police DAMS portal or contact 101 quoting Op Guelder, with anonymous tips accepted by Crimestoppers.