She died in his Washington apartment after a long illness, the Gridiron Club, historical organization press of Washington, said.
Ms. Thomas has covered the administrations of 10 presidents and was known to ask difficult questions.
She was a unit in the White House press conferences and regarded as a pioneer for women in journalism.
Born to Lebanese immigrants in Kentucky in 1920, Helen Thomas has found his calling in working for his student to school newspaper.
It began as a daughter of copy for a small Washington newspaper before moving to the United Press (UPI) Wire Service with which she covered the presidential campaign of John F. Kennedy.
After the election of Kennedy, the huge demand for stories about the first lady Jacqueline Kennedy helped Ms. Thomas secure his place in the White House press corps.
Over the next decade, she started to report the news more became the White House the Head Office of the IPU in the 1970s - the first woman to hold this position.
From his seat in the middle of the first row of the briefing room, she chairs grill and infuriate Government spokesman with its sharp, persistent questions.
An attached White House press has described his examination of "torture" - and he was one of her fans, the Associated Press reports.
It has been particularly difficult in former president George W. Bush and constantly challenged on the war in Iraq, calling it to another journalist in 2003 as the "bad president ever".
"I have never covered the president in any other way than that it is ultimately responsible for," she said. "
Ms. Thomas has been a pioneer for women in journalism, winning a series of firsts in his career.
She became the first female President of the White House Correspondents Association (WHCA), the first woman member of the Gridiron Club and the only woman journalist impression to travel with president Richard Nixon during his first trip to China.
As the main service of news at the White House, she often was the one who put an end to the news conference with the phrase "Thank you, Mr. President."
His career ended under a cloud in 2010 after having stated in an interview that Israeli Jews should "get the hell out of Palestine" and "go home" in Germany, Poland and America. ''
Later, she said that she deeply regretted the comments, saying "they do not reflect my sincere belief that peace will come to the Middle East only when all parties recognize the need for mutual respect and tolerance".
Her husband, Douglas Cornell, who was a correspondent in head of the White House for the Associated Press, died in 1982.
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