Cruz, a former Stoneman Douglas student, roamed the hallways of the 1200 building on campus February 14 for several minutes, targeting victims huddled in classrooms on the first and second floors, killing 14 students and three school employees in one of the deadliest mass shootings in modern U.S. history.
The report detailed Cruz's years within the school system, the newspaper said. "It's just regular me just trying to be a good person".
School and government records previously made public have revealed that Cruz was diagnosed as developmentally delayed at age 3 and had disciplinary issues dating to middle school.
The school district also chose to discontinue Cruz's behavior intervention plan because his "target behaviors were no longer in evidence and the plan was no longer needed".
Cruz told the detective he wanted a psychologist "to find out what's wrong with me". But he only got sick, he says.
Cruz told the detective that he planned to shoot people at a park the week before, according to the transcript.
Cruz's attorneys have said he would plead guilty in exchange for a sentence of life without parole.
He also seems unable to recall what city he was born in or the name of the friend he had temporarily been living with, although he does ask whether the friend is "okay".
The detective asked if the supposed voice had given specific instructions related to the massacre, including the fact that Cruz took an Uber to the high school.
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Cruz became defensive of those accusations, and told the detective over and over, "I don't like the demon", before asking for an attorney and ending the interrogation.
Cruz has been charged with 17 counts of murder in connection with the Marjory Stoneman Douglas High School shooting, as well as 17 counts of attempted murder.
A Florida newspaper faced an ethical dilemma after a school district's mistake exposed details that were supposed to be redacted from its lengthy examination of the education of school shooting suspect Nikolas Cruz.
When the detective left the room, Cruz again started talking to himself. To me, it's me and then my bad side.
Cruz will face the death penalty if convicted on the murder charges. Cruz said he would do what the voice told him to stop from being lonely.
"I hear demons. a voice, demon voice", he said, adding that the voice had told to hurt people on the night before the shooting. Sometimes, he would cut himself, Cruz said, including on the morning of the shooting, when took a blunt knife to himself at a lake where he had gone fishing. Cruz couldn't remember exactly, but he didn't want to do it. Curcio asked why he didn't.
"You - your - people think you're a monster now", 18-year-old brother Zachary Cruz told him.
The review of the district's conduct found that key missteps were made in handling Cruz's significant and well-documented special needs, including a failure to provide him with a full range of therapeutic services during his time at Marjory Stoneman Douglas High School.
"She would cry", Nikolas Cruz said. However, if you or someone else is in danger or endangering others, call police immediately on 111.