Hamma Sur Abdullah, 40, who died of flu-like symptoms a little over a week after his niece, was confirmed by a lab in Cairo as having died of the same cause, a senior Kurdish health official told AFP.
A few days after Mr Abdullah's death, the World Health Organisation (WHO) lab confirmed his niece Shajin Abdel Qader had died of bird flu, galvanizing an international response.
Further tests are underway, in Britain, on virus samples from Mr Abdullah, as well as on samples from a woman who comes from the same region and remains in hospital with bird flu’s characteristic flu-like symptoms.
Those tests will tell researchers if the virus is in anyway mutating.
Before news of the second bird flu death emerged, the WHO said that there were seven more suspected cases of bird flu in Iraqi Kurdistan.
"Apart from the girl who died there are seven suspected cases of bird flu and we have taken their blood samples and sent them to Cairo for further investigation," Naeema al-Gasseer, the WHO representative in Iraq, told reporters.
Ibtisam Aziz, head of a committee set up to fight the virus, said it was still confined to the village in the Raniya district of Sulaimaniyah province where the dead girl lived.
Help coming
The United States has sent a large consignment of masks, gloves and gowns to Iraq to help doctors tackle any larger outbreak.
It will arrive within the next two days.
The WHO said it was dispatching thousands of doses of the anti-influenza drug Tamiflu after reports of an acute shortage.
And Health attaché at the US embassy Jon C. Bowersox, is working with the Iraqi health ministry to help check the spread of the virus.
He said the issue was not a shortage of medicines or equipment but how to make it quickly available.
A massive poultry cull has been underway in Kurdistan following the announcement of bird flu.
In the province of Diyala along the Iranian border, health ministry officials were spreading disinfectant around poultry-producing areas.
"We are checking people coming from Kurdistan and Iran to Diyala and spreading disinfectants on their vehicles," Hashim Ibrahim, head of Diyala's veterinary department said.
"We have also closed the market in the centre of (the provincial capital) Baquba as usually there are many clusters of people," he added.