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ORLANDO, FL - JUNE 12:  FBI agents investigate near the damaged rear wall of the Pulse Nightclub where Omar Mateen allegedly killed at least 50 people on June 12, 2016 in Orlando, Florida. The mass shooting killed at least 50 people and injuring 53 others in what is the deadliest mass shooting in the country's history.  (Photo by Joe Raedle/Getty Images)
ORLANDO, FL - JUNE 12:  FBI agents investigate near the damaged rear wall of the Pulse Nightclub where Omar Mateen allegedly killed at least 50 people on June 12, 2016 in Orlando, Florida. The mass shooting killed at least 50 people and injuring 53 others in what is the deadliest mass shooting in the country's history.  (Photo by Joe Raedle/Getty Images)

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    Police records paint timeline of Pulse mass shooting

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Police records paint timeline of Pulse mass shooting

Orlando Police have released records which establish a chilling timeline of the Pulse nightclub mass shooting. CNN's Miguel Marquez reports.

Police records paint timeline of Pulse mass shooting

Orlando Police have released records which establish a chilling timeline of the Pulse nightclub mass shooting. CNN's Miguel Marquez reports.