Satwant Singh Kaleka, the president of the gurdwara in Milwaukee suburb, stood up to the rampaging white supremacist with a knife and fought to the very end.
He suffered gunshot wounds while trying to take down the gunman.
Six people, including Satwant Singh, were killed Sunday when Wade Michael Page attacked a gurudwara in Oak Creek. Page was shot dead.
"It's an amazing act of heroism, but it's also exactly who he was," Amardeep told reporters.
The six killed in Sunday's attack were identified by police as five men -- Kaleka; Sita Singh, 41; Ranjit Singh, 49; Prakash Singh, 39, and Suveg Singh, 84 -- and a woman, 41-year-old Paramjit Kaur.
Amardeep Kaleka said that the Federal Bureau of Investigation (FBI) told him his father attacked the shooter in the lobby. There was a "blood struggle". A knife close to the victim's body showed blood on it, he said.