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This undated photo provided by the Las Vegas Metropolitan Police Department shows Marilou Danley. Danley, 62, returned to the United States from the Philippines on Tuesday night, Oct. 3, 2017, and was met at Los Angeles International Airport by FBI agents, according to a law enforcement official. Authorities are trying to determine why Stephen Paddock, Danley's boyfriend, killed dozens of people in Las Vegas Oct. 1, in the deadliest mass shooting in modern U.S. history. (Las Vegas Metropolitan Police Department via AP, File)
This undated photo provided by the Las Vegas Metropolitan Police Department shows Marilou Danley. Danley, 62, returned to the United States from the Philippines on Tuesday night, Oct. 3, 2017, and was met at Los Angeles International Airport by FBI agents, according to a law enforcement official. Authorities are trying to determine why Stephen Paddock, Danley's boyfriend, killed dozens of people in Las Vegas Oct. 1, in the deadliest mass shooting in modern U.S. history. (Las Vegas Metropolitan Police Department via AP, File)

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    Gunman's girlfriend being questioned by FBI

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Gunman's girlfriend being questioned by FBI

Marilou Danley, the girlfriend of the Las Vegas gunman, has now returned to the US and is being questioned by the FBI. CNN's Stephanie Elam has her story.

Gunman's girlfriend being questioned by FBI

Marilou Danley, the girlfriend of the Las Vegas gunman, has now returned to the US and is being questioned by the FBI. CNN's Stephanie Elam has her story.