As for his family life, Cruz was adopted by Lynda Cruz, said Kathie Blaine, her cousin.
"And there the carnage began".
But he said that he assumed that's why he had a gas mask on.
Authorities later announced that they had taken the suspect into custody.
"An 18-year-old with an AK-47 and an AR-15 is completely unreasonable", said Frank Fernandez, director of public safety in Coral Gables, Florida, and the chairman of the International Association of Chiefs of Police's firearms committee.
There was a sea of candles and a moment of silence as the victims' names were read aloud.
The American Civil Liberties Union joined in opposing the rule, saying there was no evidence that people with mental disabilities were more likely to commit gun violence. "Sometimes it really f***ing works".
On his Instagram page, Cruz posted a photo of a shotgun, in another photo he is shown brandishing a pistol that appears to be a type of BB gun. "We need action, action, action!" Portraits of those who were killed have been emerging as the enormity of the human tragedy left behind by the shooting spree begins to become clear. A student who was a part of the Junior Reserve Officers' Training Corps said Cruz was a "psycho", who was quite interested in weapons.
"We were told a year ago that he wasn't allowed on campus with a backpack on him", Mr Gard told the "Miami Herald".More news: Ronaldo sets record with 100th Champions League goal for Real
And while the President said he was preparing to "tackle the hard issue of mental health", the school superintendent in Broward County, Florida-where the mass shooting took place-said "NOW is the time for this country to have a real conversation on gun control".
"We didn't hear the bullets, but we heard the helicopters", he said. "There was no warning that we saw".
Cruz was expelled from the school in Spring 2017 for threatening students. And if adults can not manage that in their lifetimes, he said, students will do it.
"He's always had a certain amount of issues going on".
Last February, Trump quietly signed a bill to scrap an Obama-era regulation making it tougher for people with mental illnesses to buy a gun.
Once inside, police say he unleashed a spray of gunfire on the first and second floors over the course of six minutes, sending frantic students and staff running for cover.
Their Twitter account, regularly has messages of admiration for this AR 15, even after the assault-rifle has been used to assassinate numerous individuals in numerous shootings.
"Everything he posts is about weapons", one student told ABC News.
He returned to the high school on Wednesday and pulled a fire alarm, hoping to lure more targets into his shooting path, authorities said.
He seemed like "just a mildly troubled kid who'd lost his mom" during the three months they lived together, Mr Lewis said.
"How do you tell your kids that it's okay?"