Surjit's brother Jagdeesh Singh told ITV News he has written to Prime Minister David Cameron asking him to put pressure on the Indian Government to reinvestigate the murder of his sister Surjit Athwal.
Ms Athwal was killed in India in 1998. Her mother-in-law and husband were convicted of ordering the killing but no one has ever been found of actually carrying out the murder.
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The pride march got underway at 11.30am this morning in Nottingham.
Sections of the railway line will close from today and not open again until Monday 8th August for upgrade work.
The annual Nottinghamshire Pride festival takes places today, including a minute's silence to remember the Orlando victims.