Lindsey had also shot and killed himself.
Orlando police officers were called to the complex on Sunday evening by Lindsey's girlfriend, because of a domestic dispute, authorities said.
"There's no explanation for what happened that day", Abdelhamid Dhhirni said.
Benenati tells our NBC affiliate WESH that 6-year-old Aiden loved dinosaurs, 10-year-old Lillia loved Disney and 12-year-old Iraya loved video games and was an overachiever in school.
The 21-hour ordeal started shortly before midnight on Sunday when Orlando police responded to a domestic violence call by the suspect's girlfriend.
On May 8, Lindsey was taken from the jail in Seminole County, where he was being held on a retail theft charge, to the Volusia County Branch Jail for violating his probation stemming from a December 2008 incident in Orange City where he got into an argument with his then-fiancee, records show.
The standoff at the apartment complex at 4932 Eaglesmere Dr., off Kirkman Road near Universal Orlando, forced residents from their homes in the middle of the night early Monday as SWAT officers descended on the complex.
At least one officer managed to return fire at Lindsey and Mina warned they were not responsible for the death of the children.
And Dove, who was 22 months old, simply enjoyed running and playing outside.
Many have been wondering about the four children and how their mother is coping with the loss.
Family members of the four children are "in shock", family friend Walter Benenati told ABC News. Lindsey was the father of the younger two, he said. Lindsey committed suicide inside a bedroom closet.
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Orlando police Chief John Mina said at a press conference just before midnight that the suspect, who was identified as 35-year-old Gary Wayne Lindsey Jr., was found dead in a closet when officers entered the apartment almost 24 hours after the standoff began.
Neighbours in the Florida apartment complex described Lindsey as both nice and odd.
"His kids were attractive, sweet children - well-mannered, as well", Gonzalez said.
Police fired back, but Mina said that investigators thus far have uncovered no evidence suggesting that Lindsey or any of the children holed up with him were struck by law enforcement's bullets.
"We are raising money for Ciara who lost her four handsome children on June 11". "Whenever we'd say, 'Hi". The Medical Examiner's office declined to comment. "How are you?' He was like ...", Lopez said, shaking his head to indicate that they got no response.
The suspect's girlfriend reportedly phoned in the complaint after she'd left the home.
As Rondinelli was leaving with her dogs, she saw Lindsey, 25 at the time, carrying two gasoline cans into the house, according to the report.
In April 2012, the woman - whose name USA TODAY is withholding because of a policy not to publish the names of domestic violence victims - filed a complaint with police after Lindsey battered her and threatened to kill her after an argument about taking Aiden, then seven months old, to the doctor.
Lindsey was sentenced to 10 years of supervised probation, followed by unsupervised probation.
Almeida said he didn't know Lindsey personally but would see him wearing a gas mask and spray-painting items beside a tree outside his apartment building. "He didn't look like anyone who would cause trouble".
If you or someone you know are struggling with mental health issues or need more information on suicide prevention, contact Lifeline on 13 11 14.