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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A dry day ahead with good spells of sunshine, but cold and frost continuing.
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Wintry showers will die out and clear spells will develop overnight leading to widespread frost and ice.