Grant died of an arrhythmia while working at the World Cup.
The journalist fell in the press box during the Argentina-Netherlands game.
In the days leading up to the game, the American said he felt pressure in his chest.
An autopsy done by the New York City Medical Examiner's Office found no cause of death, according to his wife.
"Grant died from the rupture of a slowly growing, undetected ascending aortic aneurysm with hemopericardium," she said on Wednesday.
A rupturing of the aorta is when a bulge or swelling in the main arteries that carry blood away from your heart tears stops the flow of blood.
Gounder said that the chest pressure he experienced may have been indicative of the initial symptoms.
He wouldn't have survived if there was a lot ofCPR or shocks. His death wasn't related to Covid. His death wasn't related to vaccine status.
There wasn't anything sinister about his death.
Gounder expressed her gratitude to the world of sport.
Some of the United States team he had been covering in Qatar received messages after his death.
Gounder said that Grant was a man who approached the world with openness and love.
Grant was a devoted husband, brother, uncle, and son who was our greatest team mate and fan. To share his company was our greatest love and source of joy, and we will never forget it.
Earlier in the tournament Wahl said he was stopped from entering the United States' group match against Wales because he was wearing a T-shirt in support of same-sex relationships, which are illegal in Qatar.
He had also accused Qatari organisers of apathy and indifference over migrant worker deaths around the tournament. The rights and welfare of migrant workers in Qatar have been the focus of international criticism, with differing claims over the number of deaths.
He wrote last week that he had been to a hospital in the Middle East and was told he had bronchitis.
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