What are the details?
Cruz, 19, reportedly opened fire on students and staff at Marjory Stoneman Douglas High School in Parkland, Florida, killing 17 people and injuring at least 14 more.
Cruz was a former student at the school and had been expelled for disciplinary problems.
According to Florida state law, if Cruz is convicted and a jury unanimously recommends the death penalty, a judge could enforce the execution.
Florida state law specifies that a person sentenced to death could elect death by electrocution or lethal injection.
— Fox News (@FoxNews) February 15, 2018
According to the Washington Post, authorities confirmed that Cruz did purchase the weapon himself.
Peter J. Forcelli, special agent in charge of the Miami field division of the Bureau of Alcohol, Tobacco, Firearms and Explosives, said that Cruz "purchased the firearm legally."
"No laws were broken in his acquisition of the firearm," Forcelli added.
Lewis told the South Florida Sun-Sentinel that the family Cruz was staying with knew about the weapon.
"It was his gun," Lewis said. "The family made him keep it in a locked gun cabinet in the house but he had a key."
The number of charges could change depending on whether more victims succumb to their injuries.