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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Two people have been injured in a house explosion this morning.
Motorists are being warned of havoc on the roads on Monday as snow turns into ice following a weekend wintry blast.
The latest West Midlands weather forecast has sun - but it's still a cold day ahead.