Spectrum News 13 in Orlando identified the slain reporter as 24-year-old Dylan Lyons. One of the station's photographers, Jesse Walden, was "critically injured" in the shooting, the station said.
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Authorities identified the girl and woman who were killed in the deadly rampage that spanned three locations as 9-year-old T'yonna Major and 38-year-old Nathacha Augustin.
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The suspect, 19-year-old Keith Melvin Moses, has been taken into custody, Orange County Sheriff John Mina said. He appeared in court Thursday.
His arrest ended a spate of violence that stretched several hours in a neighborhood just west of Orlando.
Police released bodycam video Thursday of Moses' arrest, which, police say, shows Moses still had the gun used in those shootings when officers found him.
Part of the video has been blurred by police.
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"No one in our community -- not a mother, not a 9-year-old, (and) certainly not news professionals -- should become the victim of gun violence in our community," Orange County Sheriff John Mina said.
In addition to the three killings, the suspect is also accused of injuring the girl's mother.
Investigators are trying to determine the motive behind the attacks.
"We really don't know what was in the mind of this suspect," Mina said. "Hopefully at some point that he'll talk to us about what his motives were."
How the deadly rampage unfolded
The first shooting was reported around 11 a.m. Wednesday. A woman in her 20s was killed inside a vehicle on Hialeah Street in Orange County. That woman is believed to be an acquaintance of the suspect, Mina said.
Later in the day, after that vehicle had been towed, the gunman returned to the area and shot two Spectrum News 13 journalists who were covering the woman's killing, Mina said.
The suspect then entered a home on a nearby street and shot a mother and her 9-year-old daughter, the sheriff said. Both were taken to a hospital, where the child died and the mother was in critical condition Wednesday evening, authorities said.
"We don't know why he entered that home," the sheriff said.
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Investigators also are looking into whether the suspect knew that the Spectrum News 13 employees were journalists.
Authorities said they believe Moses had no connection to the journalists nor the mother and her daughter.
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Investigators quickly identified Moses as a suspect in the first shooting and were following leads when the TV journalists were shot around 4 p.m., the sheriff said.
The two journalists were shot in or around their vehicle, Mina said.
"That vehicle was almost exactly in the same spot as the vehicle was from the homicide this morning," Mina said. "It's unclear why exactly they were targeted."
The journalists' vehicle "didn't look like a typical news vehicle with a lot of markings on it," Mina said.
'Every reporter's absolutely worst nightmare'
Spectrum News 13, a CNN affiliate, posted a tribute on its website titled "Remembering Spectrum News 13 reporter Dylan Lyons."
"He took his job very seriously. He loved his career. He loved what he did," fellow reporter Josh Miller said in the tribute. "He loved the community, telling the stories of people, reporting on the news, and he was just passionate about what he did."
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Spectrum News 13 also thanked employees of competing news outlets for rushing to their colleagues' aid.
Johny Fernandez remembers his former colleague, Dylan Lyons
"Some of our competitors ... rushed to the aid of our colleagues, and we want them to know how much we appreciate them," anchor Tammie Fields said. "Because when danger was happening, they could have run the other way. But apparently they ran right over to our crews and helped."
Luana Munoz, a reporter for CNN affiliate WESH, described an emotional scene after her fellow journalist died. Her colleagues had left the crime scene on Hialeah Street moments before the shooting, according to the station.
"This is every reporter's absolutely worst nightmare. We go home at night afraid that something like this will occur and that is what happened here," Munoz said. "We have learned that a fellow reporter has died while covering a shooting."
"There are members of his family here, along with his fiancée, who are incredibly distraught tonight," Munoz said. "There are other media people who are corralled together and standing in solidarity tonight as one of our own has passed."
Spectrum News 13's parent company, Charter Communications, released a statement following the attack.
"We are deeply saddened by the loss of our colleague and the other lives senselessly taken today," the statement reads. "Our thoughts are with our employee's family, friends and co-workers during this very difficult time. We remain hopeful that our other colleague who was injured makes a full recovery. This is a terrible tragedy for the Orlando community."
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In a statement, CNN called the shooting "an absolute tragedy" and noted that the organization "stands with our affiliate partner, Spectrum News 13, and will support them and the families of these journalists in any way we can."
White House press secretary Karine Jean-Pierre released a statement, saying, "Our hearts go out to the family of the journalist killed today and the crew member injured in Orange County, Florida, as well as the whole Spectrum News team."
After seeing the heartbreaking news from Spectrum News 13 in Orlando, the Reporters Committee shared a statement of solidarity with the journalism community - mourning the deaths of Spectrum News 13 reporter Dylan Lyons and wishing for the full recovery of Spectrum News photojournalist Jesse Walden, as well as sending our condolences to the loved ones of the other individuals who were killed in related shootings.
"We are devastated by the death of Spectrum News 13 reporter Dylan Lyons, who was fatally shot while reporting at the scene of a homicide investigation. The Reporters Committee joins the journalism community in mourning his death and sends our deepest condolences to his family, friends, and colleagues, as well as to the loved ones of the other individuals who were killed in related shootings that day. We also stand with all those who are wishing for the full recovery of those who were injured, including Spectrum News photojournalist Jesse Walden. Every day, journalists across the country go out into the field to do the essential work of bringing important information to their communities. We are sadly seeing journalism become an increasingly dangerous profession in the United States, and it should not be this way," Executive Director Bruce Brown said in a statement.
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