THE woman killed by a lorry as she walked on the M4 near Llangyfelach had recently left Morriston Hospital, it is understood.
Police are continuing to investigate the fatal collision in the early hours of Wednesday morning, and are appealing for anyone with information to come forward.
The woman — who is yet to be formally identified — died after being struck by a lorry on the eastbound off-slip of the motorway at junction 46 at around 4am.
The Evening Post understands that the woman had been to Morriston's A&E unit shortly before incident, though how she came to be wandering alone on the slip road is unknown and police are now trying to piece together her final movements.
Officers are urging anyone who saw a woman walking in the area in the minutes before the collision to come forward.
A spokesman for South Wales Police said: "Police are investigating a serious road traffic collision which happened during the early hours of Thursday morning on the M4 eastbound slip road at Llangyfelach.
"The incident happened at around 4am when a white MAN lorry came into collision with a female pedestrian, resulting in her suffering fatal injuries.
"Police are appealing to anyone who witnessed the collision — or anyone who saw the lorry or a pedestrian in the area of the Llangyfelach interchange prior to the collision — to come forward."
The M4 eastbound was closed between the Penllergaer and Llangyfelach junctions for around five hours while the emergency services dealt with the incident.
The circumstances of the woman's death are being investigated but one Post reader, Sarah Loosmoore-Cook, left a message on the paper's Facebook page saying she had seen a woman walking away from Morriston down the middle of the road at around 3.45am — and had had to swerve to avoid her.
Can you help? Call South Wales Police on 101, or Crimestoppers anonymously on 0800 555111 quoting reference number 1400298140
Jason Evans / firstname.lastname@example.org / @EvansTheCrime