Police have released the names of the people killed following a crash on the M4 on Tuesday.
Sarah-Jayne Thomas, 28, from Penlan in Swansea, and Timothy Peter Grace, 31, from Treboeth in Swansea were killed in a single vehicle crash.
Sarah-Jayne Thomas died at the scene.
Timothy Peter Grace sustained serious injuries and was airlifted to hospital.
He died at the University Hospital of Wales, Cardiff, on Wednesday evening.
Specially trained police officers are supporting both families.
The accident happened on the westbound carriageway between junction 37 for Porthcawl and junction 38 for Margam near Port Talbot.
Anyone who witnessed the collision or has any dash-cam footage should call the police on 101.