Noel Bartram, group chief executive of Bernard Matthews Farms, said Mr Matthews died on Thursday afternoon.
Norfolk turkey tycoon Bernard Matthews has died at the age of 80, his company has confirmed.
The Bernard Matthews site at Holton has 22 rearing sheds on the old runways of the former Halesworth airfield.
Tests are being carried out after signs of the disease were spotted at a Bernard Matthews farm, at Ubbeston, near Halesworth.
Bernard Matthews , the 77-year-old founder of an eponymous British turkey company, seems to have become the center of a political imbroglio.
FORBES: U.K. Parliament Cries 'Fowl' Over Turkey Cull Payout
Plans for turkey producer Bernard Matthews to build a wind turbine faces objections from the Ministry of Defence (MoD) and the National Trust.
Bernard Matthews, the poultry firm that owns the Suffolk farm, also has operations in Hungary, which suffered an outbreak of avian flu in late January.
Three years later he bought Great Witchingham Hall, near Norwich - a derelict mansion with 36 acres of land which remains the headquarters of the Bernard Matthews Farms.
Bernard Matthews said it believed the site was "well chosen".
"Giving over half a million pounds of taxpayers' money to Bernard Matthews will cause considerable anger unless the business is also held to account for its bio-security lapses, " he said.
FORBES: U.K. Parliament Cries 'Fowl' Over Turkey Cull Payout
Yet Bernard Matthews has little to fear for now.
FORBES: U.K. Parliament Cries 'Fowl' Over Turkey Cull Payout
The firm's founder, chairman and spokesman must be glad he and his family chose to take Bernard Matthews private in 2000 following three decades as a public company, since there would have been much shareholder unease following the culling in February.
FORBES: U.K. Parliament Cries 'Fowl' Over Turkey Cull Payout
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