Nikolas Cruz jumped out of the Uber car and walked toward building 12 of the Marjory Stoneman Douglas High School, carrying a black duffel bag and a black backpack. A man inside the school spotted Cruz, and knew he was a former student. A troubled kid. The man radioed a co-worker, and within a minute heard gunshots.
The 19-year-old was wearing a maroon shirt, black pants and a black hat. The man, whose name was blacked out from a sheriff's affidavit, told detectives Cruz was moving "purposefully."
He slipped into the building, entered a stairwell and extracted a rifle from his bag, authorities said. He shot into four rooms on the first floor - going back to spray bullets into two of the rooms a second time - then went upstairs and shot a single victim on the second floor. He ran to the third floor, where according to a timeline released by the Broward County Sheriff's Office, three minutes passed before he dropped the rifle and backpack, ran back down the stairs and quickly blended in with panicked, fleeing students.
From the time Cruz entered the building until the time he left, only six minutes passed. During that brief time, he shot more than two dozen students, 17 of them fatally.
After the rampage, the suspect headed to a Wal-Mart and bought a drink at a Subway restaurant before walking to a McDonald's.
About 40 minutes later after leaving the McDonald's, a deputy saw him walking down a suburban South Florida street and grabbed him. He didn't put up a fight.
The details of Wednesday's carnage at the Parkland, Florida, high school emerged a day later from witnesses and law enforcement reports.
Cruz was ordered held without bond at a brief court hearing. He wore an orange jumpsuit with his hands cuffed at his waist. His attorney did not contest the order and had her arm around Cruz during the short appearance.