A 72-year-old woman has died after being injured at St Boltophs Crescent in Lincoln lived in a quiet residentlal street mainly occupied by other elderly residents.
Officers from Lincolnshire Police are focusing their investigations around a block of maisonettes in the street.
A 38-year-old man is being questioned by police on suspicion of murder.
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It's believed there were around 8,000 people who laced up for this year's 10k race.
Sporadic outbreaks of rain will spread to all areas overnight, with some heavy bursts at first.
Cloudy with outbreaks of rain, mainly after midnight. Winds will start to ease.