Detectives have been given more time to question a man in relation to a murder which happened in Bilborough over the weekend.
The 32-year-old, who has been arrested on suspicion of murder, remains in police custody.
The victim, who has not yet been formally identified, was found collapsed in Fairnley Road, just after 5pm on Saturday.
He was taken to Nottingham's Queen's Medical Centre, where he later died.
A post-mortem examination revealed the man died from a gunshot wound.
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Thousands from around the country went to the Black Country to take part in Tough Guy - a challenge with more than 250 obstacles.
Mainly dry overnight but very cold with temperatures dropping sharply as winds ease down giving a widespread frost.
It will be dry with clear spells across the region overnight.