Gian Mario Ruggeri was shot several times by an assailant in the street early on Saturday as he was walking into a gym at Castelli Calepio, on the outskirts of Bergamo.
The 44-year-old was the half-brother of ex-Atalanta president Ivan Ruggeri, who died in April after five years in a coma following a brain haemorrhage.
Known as Jimmy, he had problems with the law in the past, placed under house arrest in 2000 amid an investigation into false accounting.
Alessandro Ruggeri – the son of Ivan and nephew of Gian Mario – was president of Atalanta from 2008 to 2010.
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