One man, Kevin West, has come forward and told that he had talked with Mateen over the gay dating app Jack'd on and off for about a year, as per the Los Angeles Times.
Meanwhile, Mateen's second wife, Noor Zahi Salman, today arrived at the apartment she had shared with the terrorist with their three-year-old son to collect their belongings.
She was seen for the first time today since the nightclub massacre took place.
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Salman was escorted from a car to the front door by police officers.
So far, authorities have not yet confirmed if the shooter, who was killed by an elite police squad on Sunday morning, had visited the gay nightclub before and was a user of the gay dating app.
Mateen, who was born in New York, called police before the shooting and swore allegiance to the terrorist group Islamic State, according to the police.
FBI Director James Comey revealed that Mateen was monitored for 10 months because of radicalism and was previously interviewed by the FBI, but the agency found no reasons to prohibit him to purchase weapons.
Despite the red flags Mateen raised in his interactions with others, the mass killer was able to purchase a handgun and an assault rifle legally in the days before the massacre, Trevor Velino of the Bureau of Alcohol, Tobacco, Firearms and Explosives told reporters.
He had tried to buy body armor, but the store where he tried to make the purchase doesn't sell that product, according to a store manager.
FBI Director James Comey said the agency was "highly confident" Mateen was radicalised, at least in part, by viewing extremism on the internet.
"There are strong indications of radicalisation by this killer and of potential inspiration by foreign terrorist organisations," Comey said.
Despite the clamour for retaliatory action to Sunday's daring cross-border terror attack from Pakistan on an army base at Uri in Jammu and Kashmir that claimed the lives of 18 soldiers, experts and analysts are of the view that India should look for alternate paths other than military options.