Teacher Ashling, from Tullamore, Co. Offaly was murdered on Wednesday.
The 23-year-old had gone for an afternoon run when her killer struck.
The vigil in Derry was staged by Alliance for Choice at 4pm on Friday and a large crowd attended.
17. DER - ASHLING MURPHY VIGIL
People hold candles at the vigil for Ashling Murphy held at the Guildhall Steps on Friday afternoon. Photo: George Sweeney. DER2202GS – 097
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Local students among the crowd at the vigil for Ashling Murphy held at the Guildhall Steps on Friday afternoon. Photo: George Sweeney. DER2202GS – 098
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A student at the vigil for Ashling Murphy places flowers on the Guildhall Steps on Friday afternoon. Photo: George Sweeney. DER2202GS – 099
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People at the vigil for Ashling Murphy place candles and flowers on the Guildhall Steps on Friday afternoon. Photo: George Sweeney. DER2202GS – 0100