Officials said a woman died while riding a roller coaster at a Six Flags Over Texas in Arlington, Texas.
The Texas Giant roller coaster ride sits idle
The Texas Giant roller coaster ride sits idle at the Six Flags Over Texas park Saturday in Arlington, Texas. Investigators will try to determine if a woman who died while riding the roller coaster at the amusement park Friday night fell from the ride after some witnesses said she wasn't properly secured. (July 20, 2013) (Credit: AP)
The Texas Giant roller coaster ride sits idle
The Texas Giant roller coaster ride sits idle at the Six Flags Over Texas park Saturday in Arlington, Texas. Investigators will try to determine if a woman who died while riding the roller coaster at the amusement park Friday night fell from the ride after some witnesses said she wasn't properly secured. (July 20, 2013) (Credit: AP)
The Texas Giant roller coaster ride sits idle
The Texas Giant roller coaster ride sits idle at the Six Flags Over Texas park Saturday in Arlington, Texas. Investigators will try to determine if a woman who died while riding the roller coaster at the amusement park Friday night fell from the ride after some witnesses said she wasn't properly secured. (July 20, 2013) (Credit: AP)

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This aerial photo shows The Texas Giant roller
This aerial photo shows The Texas Giant roller coaster ride which sits idle at the Six Flags Over Texas park Saturday in Arlington, Texas. Investigators will try to determine if a woman who died while riding the roller coaster at the amusement park Friday night fell from the ride after some witnesses said she wasn't properly secured. (July 20, 2013) (Credit: AP)
The Texas Giant roller coaster ride sits idle
The Texas Giant roller coaster ride sits idle at the Six Flags Over Texas park Saturday in Arlington, Texas. Investigators will try to determine if a woman who died while riding the roller coaster at the amusement park Friday night fell from the ride after some witnesses said she wasn't properly secured. (July 20, 2013) (Credit: AP)
A pair of Six Flags over Texas employees
A pair of Six Flags over Texas employees leave the park as they pass by the Texas Giant wooden roller coaster in Arlington, Texas. A woman has died while riding the roller coaster. (July 19, 2013) (Credit: AP)
Emergency personnel are on the scene at Six
Emergency personnel are on the scene at Six Flags Over Texas in Arlington, Texas, after a woman died on the Texas Giant roller coaster, background left. (July 19, 2013) (Credit: AP)
Members of the Putnam family, who were present
Members of the Putnam family, who were present when a woman died while riding a roller coaster, are interviewed by reporters at Six Flags Over Texas in Arlington, Texas. John Putman told the Fort Worth Star-Telegram, "They were screaming, 'My mom! My mom! Let us out, we need to go get her!" (July 19, 2013) (Credit: AP)

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News reporters prepare for their broadcasts at Six
News reporters prepare for their broadcasts at Six Flags Over Texas in Arlington, Texas, where a woman died while riding a roller coaster after some witnesses said she wasn't properly secured. Park spokeswoman Sharon Parker confirmed that a woman died while riding the Texas Giant roller coaster -- dubbed the tallest steel-hybrid coaster in the world -- but did not specify how she was killed. (July 19, 2013) (Credit: AP)