Orlando shooter texted wife during rampage, troubled past now coming to light

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As Omar Mateen was in the midst of the mass shooting at the Pulse gay nightclub in Orlando, Florida, he was sending text messages to his wife Noor Salman, according to a source close to her. This information comes as investigators uncover details of Mateen’s troubled past, showing “verbally abusive, rude, aggressive” behavior as early as the third grade, and survivors of the attack pay tribute to first responders. NBC’s Stephanie Gosk reports for TODAY. (Run time: 3:16)