In the early morning hours of Sunday, June 12, 2016, a man entered the Pulse, a gay nightclub in Orlando, Fla., and perpetrated the deadliest mass shooting in U.S. history, resulting in the deaths of 49 people and injuring at least 53 others.<br><br>Orlando Police officers direct family members away from a multiple shooting at a nightclub in Orlando, Fla., June 12, 2016.

An image released by the Orlando Police shows two police officers who initially responded to reports of a shooting at the Pulse Nightclub on June 12, 2016 in Orlando, Fla.

An injured person is carried out of the Pulse nightclub after a shooting rampage, in the early hours of June 12, 2016, in Orlando, Fla.

An image released by the Orlando Police shows first responders on the scene of the Pulse Nightclub shooting working near a truck on June 12, 2016 in Orlando, Fla.

A handout image made available by Univision Florida Central shows a view of the scene following a shooting at Pulse Nightclub in Orlando, Florida, June 12, 2016.

Emergency personnel wait with stretchers at the emergency entrance to Orlando Regional Medical Center hospital for the arrival of patients from the scene of a fatal shooting at Pulse Orlando nightclub in Orlando, Fla., June 12, 2016.

Orlando police officers are seen outside of Pulse nightclub after a fatal shooting and hostage situation in Orlando, Fla., June 12, 2016.

Orlando Mayor Buddy Dyer, center right, and Orlando Police Chief John Mina, center left, arrive to a news conference after a fatal shooting at Pulse Orlando nightclub in Orlando, Fla., June 12, 2016.

Friends and family members embrace outside the Orlando Police Headquarters during the investigation of a shooting at the Pulse nightclub, after a gunman opened fire, in Orlando, Fla., June 12, 2016.

Police and rescue officers monitor the scene of a shooting at Pulse nightclub in Orlando, Fla., USA, June 12, 2016.

People wait outside the emergency entrance of the Orlando Regional Medical Center hospital after a shooting involving multiple fatalities at Pulse Orlando nightclub in Orlando, Fla., June 12, 2016.

Police lock down Orange Avenue around Pulse nightclub, where people were killed by a gunman in a shooting rampage in Orlando, Fla., June 12, 2016.

Friends and family members embrace outside the Orlando Police Headquarters during the investigation of a shooting at the Pulse nightclub, where people were killed by a gunman, in Orlando, Fla., June 12, 2016.

People wait in line at OneBlood to donate blood in the wake of the mass shooting at the Pulse nightclub in Orlando, Fla., June 12, 2016.

Police stand in front of one of the houses that officials indicated was connected to the Orlando shooter in Port St. Lucie, Fla., June 12, 2016.

Orlando Police posted this photo to Twitter with the caption, "Pulse shooting: In hail of gunfire in which suspect was killed, OPD officer was hit. Kevlar helmet saved his life."

Kelvin Cobaris, a local clergyman, consoles Orlando city commissioner Patty Sheehan, right, and Terry DeCarlo, an Orlando gay-rights advocate, near where a mass shooting occcured in Orlando, Fla., June 12, 2016.

An aerial view of the Pulse nightclub following the mass shooting in Orlando, Fla., June 12, 2016.

A Bomb Disposal Unit checks for explosives around the apartment building where shooting suspect Omar Mateen is believed to have lived on June 12, 2016 in Fort Pierce, Fla.

Volunteers waiting at a blood bank watch President Barack Obama deliver remarks on a TV after a shooting involving multiple fatalities at a nightclub, June 12, 2016, in Orlando, Fla.

A remote bomb robot arrives at the scene of the mass shooting at the Pulse nightclub in Orlando, Fla., June 12, 2016.

Law enforcement officials work at the Pulse nightclub following a mass shooting, June 12, 2016, in Orlando, Fla.

People arrive at a hotel where family members are gathering in Orlando, Florida after a mass shooting on June 12, 2016.

Investigators from the office of the medical examiner investigate on the west side of Pulse nightclub where a gunman opened fire on Sunday morning, June 12, 2016, in Orlando, Fla.

Evidence photos released by the city of Orlando in Jan. 2017 show the scene inside the Pulse nightclub during the investigation of the shooting that killed 49 people in June 2016.

Annette Stubbs, a pastor at a local church, prays for victims a few blocks from a crime scene at the nightclub where a mass shooting took place the night before in Orlando, June 12, 2016. A gunman opened fire inside the gay nightclub early Sunday, killing at least 50 people before dying in a gunfight with SWAT officers, police said.

Angel Mendez, standing outside the Orlando Regional Medical Center, holds up a cell phone photo trying to get information about his brother Jean C. Mendez that was at the Pulse Nightclub where a shooting involving multiple fatalities occurred, June 12, 2016, in Orlando, Fla.

Orlando residents Arissa Suarez (L) and Malcom Crawson attend a vigil at Lake Eola Park for victims of a mass shooting at a gay nightclub in Orlando, June 12, 2016.

People who were injured in the mass shooting at the Pulse Nightclub attend a memorial service at the Joy MCC Church for the victims of the terror attack where Omar Mateen allegedly killed more than 50 people, June 12, 2016, in Orlando.

Mourners attend a memorial service at the Joy MCC Church for the victims of the terror attack at the the Pulse Nightclub where Omar Mateen allegedly killed more than 50 people, June 12, 2016 in Orlando.

An Orlando police officer looks through a fence at FBI investigators behind the Pulse nightclub, June 13, 2016 in Orlando, Florida.

Evidence photos released by the city of Orlando in Jan. 2017 show the scene inside the Pulse nightclub during the investigation of the shooting that killed 49 people in June 2016.

Surrounded by members of the media, family and friends of the victims of the Pulse Nightclub shooting walk to their cars as they leave the Beardall Senior Center where they gathered to learn more information about loved ones who were injured or killed in the attack, June 13, 2016 in Orlando, Fla.

Family members of victims of the Orlando nightclub shooting are escorted out by volunteers as they leave a family reunification center set up at the Beardall Senior Center, June 13, 2016, in Orlando, Fla.

Tatiana Osorio of Orlando cries while giving blood near the mass shooting at a nightclub, June 13, 2016, in Orlando, Fla. Osorio lost three friends in the shooting.

Federal and local law enforcement officials walk through the street next to the scene of a mass shooting at a nightclub, June 13, 2016, in Orlando, Fla.

A police officer stands guard at a road block near the scene of the mass shooting at the Pulse nightclub early Tuesday, June 14, 2016, in Orlando, Fla.

Angel Colon, a survivor of the Orlando nightclub shooting, attends a press conference at the Orlando Regional Medical Center in Orlando, Florida, June 14, 2016.

Tiara Parker, left, and her friend Patience Carter, both victims in the Pulse nightclub shooting, embrace as they share a moment at in Carter's Florida Hospital Room before they meet President Obama, June 16, 2016, in Orlando Fla.

Andrea Drayton looks over family photos that show her daughter, Deonka Drayton, a victim of the recent mass shootings at the Pulse nightclub in Orlando, Fla., June 15, 2016.

President Barack Obama and Vice President Joe Biden visit a memorial to the victims of the Pulse nightclub shooting, June 16, 2016, in Orlando, Fla.

A note stating that the family has no comments is taped to the door of the home of Seddique Mir Mateen, father of Omar Mateen, June 17, 2016, in Port St. Lucie, Fla. Omar Mateen was killed in a gun battle with a SWAT team after he opened fire at Pulse nightclub in Orlando, Fla.

This combination of photos shows some of the dozens of those killed in a mass shooting early Sunday, June 12, 2016 at the Pulse gay nightclub in Orlando, Fla.