Mandy Burgess, 42, is believed to have gone on a luxury holiday after she was one of 100 people to scoop the jackpot in a special EuroMillions Olympic draw.
Her numbers came up only a day after her nephew Stapleton was jailed for life for shooting an Indian student, dead at point-blank range and standing over his body laughing.
Burgess, a mother of three who married into a notorious Manchester crime family, won the jackpot in a EuroMillions Raffle to celebrate the start of the London Olympics.
Stapleton, 21, who is the son of Burgess's sister Billie Jean, has been told he must serve at least 30 years in prison for the murder of Anuj Bidve, 23, on Boxing Day last year.
He walked up to Bidve, whom he had never met before, in the street in Salford, Greater Manchester, and shot him in the head at point-blank range.
He admitted manslaughter on the grounds of diminished responsibility but was convicted of murder by a jury at Manchester Crown Court.
The killer, who even sniggered as he was sentenced by a judge, became notorious after he gave his name as 'Psycho Stapleton' during his first court appearance in the case.
Burgess was married to Damian Noonan, a major figure in Manchester's criminal underworld before his death in a motorcycle crash in 2003 at the age of 37.
Noonan's brother Domenyk has featured in a documentary made by investigative journalist Donal MacIntyre about organised crime.
The family has also been profiled in a television series called At Home With The Noonans.
Burgess's son Damien Noonan, 25, was jailed for six years and nine months in May after he plotted to flood the streets with a banned dance drug and arranged the brutal abduction and torture of a man.