Omar Mateen opened fire at the Pulse Nightclub in Orlando, Fla., in June 2016. Mateen died in the attack, which left 49 victims. Only his widow stood trial for charges related to the massacre. Gerardo Mora/Getty Images hide caption
omar mateen
Seddique Mir Mateen, father of Omar Mateen, speaks with reporters in Fort Pierce, Fla., in 2016. Alan Diaz/AP hide caption
Omar Mateen killed 49 people and injured dozens more in a mass shooting on Latin night at the gay club Pulse in Orlando, Fla., in 2016. Chris O'Meara/AP hide caption
Jury Selection Begins For Orlando Shooter's Widow
Olivia Baez, a nurse at Orlando Regional Medical Center, cared for victims of the shooting that night. She says she comes to the Pulse memorial nearly every day. Ari Shapiro/NPR hide caption
Activists hold a banner in front of the Pulse nightclub site on Thursday in Orlando, Fla. John Raoux/AP hide caption
Artwork and signatures cover a fence around the Pulse nightclub, scene of a mass shooting, in Orlando, Fla. Noor Salman, widow of gunman Omar Mateen, is accused of aiding her husband's attack. John Raoux/AP hide caption
Investigators work at the Pulse nightclub in Orlando, Fla., following a mass shooting in June 2016. A California judge has ruled that Noor Salman, the widow of the gunman, Omar Mateen, can be released pending her trial on charges of aiding her husband's attack. Chris O'Meara/AP hide caption
Artwork and signatures cover a fence around the Pulse nightclub in Orlando, Fla., on Nov. 30, 2016. John Raoux/AP hide caption
Law enforcement officials work at the Pulse nightclub in Orlando, Fla., in June following the mass shooting. Chris O'Meara/AP hide caption
The mosque in Fort Pierce, Fla., where Pulse nightclub shooter Omar Mateen had worshipped, is shown on June 14. A fire broke out at the Islamic Center of Fort Pierce early Monday. Brendan Smialowski/AFP/Getty Images hide caption
Forty-nine people were killed in a mass shooting at Pulse nightclub in Orlando, Fla., in the worst mass shooting in modern U.S. history. Carolyn Cole/LA Times via Getty Images hide caption
A makeshift memorial developed last month in honor of 49 people who were killed in the shootings at the Pulse nightclub in Orlando, Fla. Chris O'Meara/AP hide caption
Traffic moves along Orange Avenue last month after authorities opened the streets around the Pulse nightclub, scene of a recent mass shooting in Orlando, Fla. John Raoux/AP hide caption
Angel Colon was shot three times at Pulse. "I'm just there laying down and I'm thinking, 'I'm next. I'm dead,' " he said. Brendan Smialowski/AFP/Getty Images hide caption
Law enforcement officials block off the road near Pulse nightclub on June 15 as they continue the investigation into the shooting there. The Justice Department on Monday released a transcript of a 911 call that Omar Mateen made the night of the shooting. Joe Raedle/Getty Images hide caption
Daniel Alvear and his wife, Mayra, in their home -- hours before the funeral for Flores. Aarti Shahani/NPR hide caption
Authorities say Omar Mateen killed dozens of people inside the Pulse nightclub in Orlando, Fla., on Sunday. AP hide caption
Adebisi Alimi and his fiance. When Alimi posted the photo on social media, he received death threats. Courtesy of the author hide caption
On Wednesday, law enforcement officials continued to investigate the attack at Pulse, a gay nightclub in Orlando, Fla., where Omar Mateen killed 49 people on Sunday. Joe Raedle/Getty Images hide caption
An undated image shows Omar Mateen, who authorities say killed dozens of people inside the Pulse nightclub in Orlando, Fla., on Sunday. Myspace/via AP hide caption
Krystle Martin weeps as she views a memorial Monday for the victims of the fatal shootings at the Pulse Orlando nightclub in Florida. Chris O'Meara/AP hide caption
A Sig Sauer MCX rifle can be seen on display at the top left of this photo as NRA gun enthusiasts view the Sig Sauer display at the National Rifle Association's annual meetings & exhibits show in Louisville, Ky., in May. John Sommers II/Reuters hide caption