This photo provided by the Broward County Jail shows Nikolas Cruz, the teen suspected of killing 17 and injuring more than a dozen in a school shooting on Wednesday in Florida

A timeline of the school shooter's deadly day is beginning to take shape, as it emerged he took an Uber to the school to begin his carnage, and afterwards stopped at fast food chains.

Nikolas Cruz, 19, who was living with another family after his mother died, was supposed to go to GED classes, but when the father woke him up to drop him off on his way to work, he said something to the effect of 'It's Valentine's Day. I don't go to school on Valentine's Day,' according to a lawyer for the family.

'They just blew it off,' attorney Jim Lewis said. 'This is some 19-year-old that didn't want to get up and go to school that day, and (they) left it at that.'

At 2:06pm, Cruz took an Uber to the school he was expelled from, Marjory Stoneman Douglas High School, in Parkland.

Uber is currently working with authorities, and the company has declined to say if Cruz's driver noticed anything off about their passenger on Wednesday.

Authorities say Cruz told officers he 'brought additional loaded magazines to the school campus and kept them hidden in a backpack until he got on campus to begin his assault.'

Cruz told authorities he was able to escape the school grounds undetected after dumping his Ar-15 rifle and vest and blending in with fleeing students

Authorities say after Cruz fled by blending in with students. At 2:50pm he entered the nearby Walmart and got a drink at Subway inside of a Walmart (pictured)

He left the Walmart and walked to McDonald's and briefly sat down at 3:01pm (pictured)

He was armed with an AR-15 rifle, and was wearing a vest that was holding additional ammunition.

Broward County Sheriff Scott Israel said the suspect arrived at the high school at 2:19 p.m. Wednesday, entering the east stairwell with a rifle inside a black, soft case.

'The suspect exited the stairwell and pulled the rifle out of the case at 2:21pm local time. He then readied his rifle and began shooting into rooms 1215, 1216, 1214 ... he then went back into 1216, 1215 and then to 1213.'

'The suspect then took the west stairwell to the second floor and shot one victim in room 1234 on the second floor. The suspect then took the east stairwell to the third floor ... he then dropped his rifle and backpack containing extra ammunition and ran down the stairs ... exiting building 12 and ran toward the tennis courts.'

Police say he exited building 12 at 2:28pm.

Officers recovered the Ar-15 (pictured Wednesday) as well as the vest he dumped

Cruz told authorities he dumped the gun and the vest to blend in with escaping students

A point by point map of the gunman's movements from the shooting through his arrest

Both the vest and the rifle were later recovered by police.

'The suspect then turned west and tried to mix in with students who were trying to run away fearing for their lives, Sheriff Israel said Thursday.

'The suspect then arrived at a Walmart store and bought a drink at the Subway and left the Walmart on foot.'

According to the police timeline, he arrived at Walmart at 2:50pm.

'The suspect then arrived at a McDonald's and sat down for a short period of time around 3:01 p.m. and he left on foot.'

'At 3:41 p.m., 40 minutes after leaving McDonald's, the suspect was detained at 4700 Wyndham Lakes Drive in Coral Springs, by an officer with the Coconut Creek Police Department,' Sheriff Israel concluded.

Coconut Creek police officer Michael Leonard spotted Cruz walking down a nearby residential street after responding from his neighboring precinct.

'He looked like a typical high school student and for a quick moment, I thought could this be the person?' Leonard said. 'Is this who I need to stop?'

Leonard said he pulled over and confronted the suspected 19-year-old mass murderer.

Cruz was taken into custody without issue after around an hour of eluding police

Cruz (pictured Wednesday) was first taken to a hospital, as seen here, and then to police headquarters

'He complied with my commands and was taken into custody without any issues,' the officer said.

After he was arrested, he was first taken to an area hospital before being taken to police headquarters.

He confessed to the shooting spree that left 17 dead.

Cruz legally purchased the AR-15 rifle used in the assault at Marjory Stoneman Douglas High School, in February of 2017, according to authorities.

Cruz brought it to the family's home, where he moved into around Thanksgiving.

It was kept in a locked cabinet that the teen had a key to.

Two federal law enforcement officials said the Smith & Wesson M&P rifle was purchased legally at Sunrise Tactical Supply in Coral Springs, Florida.

Federal law allows people 18 and over to legally purchase long guns. At 21, people can legally buy handguns from a licensed dealer.

He was ordered to be held without bond during a hearing on Thursday afternoon.

Immediately after his mother died, Cruz temporarily moved into a family friend's in the Lantana Cascade mobile-home neighborhood.

Several weeks later he was taken into a friend's home in Parkland. He was staying with that family at the time of the shooting.

Hector Romero Assistant Public Defender (L) and Melisa McNeill, Public Defender (R) are seen on screen at the first appearance in court for high school shooting suspect Nikolas Cruz (C) on February 15, 2018 at Broward County Court House in Fort Lauderdale, Florida

Immediately after his mother died, Cruz temporarily moved into a family friend's in the Lantana Cascade mobile-home neighborhood (above) before moving out a few weeks later