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By Alyssa Guzman for DailyMail.com

SANDY HOOK ELEMENTARY SCHOOL, DECEMBER 2012: 27 DEAD, 2 INJURED 

In December 2012, the deadliest school shooting in America took place at Sandy Hook Elementary School in Newtown, Connecticut. 

Lanza arrived to the school with three guns - a semi-automatic AR-15 assault rifle, and two pistols after killing his mother, Nancy - with whom, he reportedly only communicated via email. 

When he arrived to the school around 9.30am, the doors were locked as part of a new safety feature the school had recently rolled out. He allegedly 'shot the entrance into the building,' according to CNN. 

The school psychologist and vice principal went to investigate after hearing 'popping' noises and the psychologist was shot by Lanza. 

The elementary school was placed in lockdown and students were ushered into restrooms and closets to hide. 

Lanza moved toward kindergarten and first-grade classrooms first. In one of the classrooms, he shot all 14 kindergarteners and six first-graders. 

By the time law enforcement arrived to the scene, 20 students and six staff members were killed. 

As law enforcement approached the 20-year-old, he shot himself. 

Although his motive is unknown, Lanza's old writings were discovered years later and shed light into the young man's mind. He had written to a fellow gamer that he had a 'scorn for humanity' and had been 'desperate to feel anything positive for someone for my entire life.' 

A child advocate's for the state of Connecticut also said Lanza had severe mental health problems and suffered from anxiety and obsessive compulsive disorder and  was on the autism spectrum. He was also preoccupied with violence, according to CBS News. 

With ease of access to his mother's weapons and being home-schooled, the advocate said it was 'proved a recipe for mass murder.' 

MARYSVILLE PILCHUCK HIGH SCHOOL, OCTOBER 2014: 4 DEAD, 1 INJURED 

Marysville student Jaylen Fryberg, 17, gathered his friends around a table in the Washington state's school cafeteria and shot each of them in the head one-by-one to take them to 'the other side,'  in October 2014. He shot them with a 'blank stare' and shot them 'left to right.' 

Fryberg had sent a photo of the handgun to a friend just moments before he would open fire, killing four. He told the person he texted to call him before he did 'the thing.' 

After shooting the four students as others watched on, he shot himself as a teacher ran toward him, the Washington Post reported. 

The teen had methodically planned the massacre, even leaving a note for his parents with his funeral arrangements and what to do with his assets, if he had any. 

He had texted his father: 'Read the paper on my bed. Dad, I love you.' 

Inside the note, he told his parents he wanted to be 'fully dressed in Camo in my casket' and all his 'trust money or whatever goes to my brother.' 

Fryberg also apologized to his friends' parents, but said he needed 'ride or dies with me on the other side.'

'I LOVE YOU FAMILY! I really do! More then anything,' he wrote. 'I needed to do this tho[ugh]…I wasn’t happy. And I need my crew with me too. I’m sorry. I love you.' 

UMPQUA COMMUNITY COLLEGE, OCTOBER 2015: 9 DEAD, 9 INJURIED 

Student Christopher Harper-Mercer, 26, opened fire in Snyder Hall at Umpqua Community College in Roseburg, Oregon, in October 2015 around 10.45am. 

He killed eight students and one teacher before police arrived. Authorities and Mercer engaged in a brief shootout, before Mercer turned the gun on himself and took his own life. 

More weapons were found in his apartment, which he shared with his mother, and he had handed a student a USB drive with his manifesto on it. 

'It's pretty well laid out that he was a dejected failure,' Douglas County Sheriff John Hanlin said at the time. 'The only thing that I can conclude from it is he was mentally and emotionally ill.' 

His manifesto detailed a life of a lonely virgin, who self-described himself as the 'most hated person in the world' and said he hated black men, whom he said only cared about their 'penises.'

Mercer also reportedly said he was constantly 'under siege' by 'morons and idiots,' the Oregonian reported.  

Mercer wrote: 'What was it that was supposed to happen, what great event was it that was supposed to make me realize how much there was going for me? 

'But for people like me there is another world, a darker world that welcomes us. For people like us this all that's left. My success in Hell is assured.'

The young man also reportedly said he was 'denied' everything he deserved and likened himself the Columbine High School, Virginia Tech, and Sandy Hook shooters. 

'Though we may have been born bad. Society left us no recourse, no way to be good,' he reportedly wrote.  

'I have been forced to align myself with demonic forces. What was once an involuntary relationship has now become an alignment, a service. I now serve the demonic Heirarchy(sic). When I die will become one of them. A demon. And I will return to kill again and again.' 

NORTH PARK ELEMENTARY SCHOOL, APRIL 2017: 2 DEAD, 1 INJURED 

Cedric Anderson, 53, entered the San Bernardino, California, school around 10.30am in April 2017, where his wife Karen Elaine Smith, also 53, worked as a special-education teacher.  

He told administrators he was there to see his wife and walked into her classroom, which was positioned near the office. 

He fired six shots from a Magnum revolver when he entered the classroom, killing his wife and an eight-year-old student and injuring another child. He reloaded the revolver and shot himself. 

Although the motive is unknown, many suspected his wife - who had recently divorced him  - was being abused, according to the San Bernardino Sun.

Since the shooting, her classroom IB, no longer exists. The classroom walls have been knocked down and it is now an open space for students to work on projects. 

The school remodeled its building and outfitted every classroom with tempered glass windows, installed steel doors with locks on the inside, and a door that leads to the outside, which is mandated by law.