Junction of the A4 Great West Road with Wood Lane in Osterley. Image: Google Street View.

Detectives are trying to trace a good Samaritan called Jan who stopped at the scene of a fatal collision on the A4 Great West Road in February.

31 year old pedestrian Janusz Adam Partyka died in a road traffic collision with a blue BMW just before 5 am 8th February near the junction with Wood Lane, Osterley.

The collision happened on the westbound carriageway and the BMW failed to stop.

The Met Police say a woman using the name Jan stopped her vehicle at the location and assisted with a call for ambulance and police.

She used another witness’s mobile handset.

Jan indicated that she witnessed the fatal collision and was on her way to the airport to pick up her parents.

Jan also returned to the scene of the collision some days later and left a condolence card that touched the hearts of the family.

Detective Sergeant Jeff Edwards of the Serious Collision Investigation Unit said:

I am appealing for this woman to call me, since she may have important information to assist with this most serious of enquiries.

If you know anyone, possibly named Jan, who has mentioned witnessing the incident, please would you urge her to contact police.

Officers from the Serious Collision Investigation Unit at Merton may be contacted on 020 8543 5157. To remain anonymous, call Crimestoppers on 0800 555 111, quoting reference 1401661/15.

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Young Londoner dies after BMW driver failed to stop on Great West Road