Police were last night investigating whether a botched job sparked the explosion which tore through a row of terraced houses in Newark.
Company director Leslie Rourke, 71, was discovered buried in rubble beneath the ground floor.
Fire crews searching the wreckage found the body of his daughter-in-law Jeanette Rourke, 40.
Mrs Rourke’s husband, Nick, 42, was taken to hospital with serious injuries after the explosion in Newark, Nottinghamshire, on Sunday.
A four-month-old girl had a miraculous escape meanwhile after being rescued from a neighbouring property along with a seven-year-old boy and another woman. All three have already been discharged from Queen’s Medical Centre.
At least 100 people were evacuated following Sunday’s explosion.
More top news
Tara Christmas's kitten Elsa was put on a drip when she collapsed last Christmas after eating the leaves of the festive plant.
Brighter for Sunday but a rather cloudy outlook for the next few days. After a chilly start for Monday temps staying on the mild side
Home Office files on the Battle of Orgreave are due to be released next year among a host of records relating to the 1984 miners' strike.