The force said the collision involved a black Volkswagen Golf and blue Mercedes AMG C250.
The driver of the VW Golf died at the scene, while his passenger, another man in his 20s, was taken to hospital with serious but not life-threatening injuries.
The stretch of road was reopened at about 12:30 on Saturday.
Police previously said A 22-year-old woman from Beaconsfield and a 21-year-old woman from Northolt in west London, were arrested on suspicion of causing death by dangerous driving.
Along with Mr Almaghrabi, they also arrested 26-year-old man from Beaconsfield on Saturday on suspicion of causing death by dangerous driving and driving a motor vehicle with a proportion of a specified drug above the specified limit.
A second 26-year-old man, from Farnham Royal near Slough, was arrested earlier on Saturday on suspicion of causing death by dangerous driving and he has been “charged in relation to the possession of a knife blade”, police said.
He was also due to appear at the same magistrates’ court on Monday.
Det Insp Edward Crofts said: “This is a complex investigation following a fatality. I would urge the public not to speculate on the circumstances or share footage on social media. Please pass any information to the investigation team.
“I would again urge anybody who may have witnessed the collision, or the manner of driving of the Mercedes in the moments leading up to the collision, to please get in touch with Thames Valley Police.”