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Matti Saari was questioned by the police over videos he made of himself doing target practice with his guns. Saari reassured them that nothing was wrong and so nothing happened to him.

I wonder if those cops have nightmares over that, knowing how much they fucked up.

Eric Harris and Dylan Klebold: Went out for a meal on the 19th and had potato skins

kip kinkel, 20th may 1998:
-bought a stolen gun (and ammo) at school
-was spoken to by an investigator about the stolen gun, and kip admitted he had it in his locker
-he, along with the person that stole the gun, was arrested
-both were suspended from school, pending expulsion
-his dad found out and took him home from the police station
-2ish hours later, kip shot his dad in the back of the head and put his body in the bathroom
-3ish hours after he killed his dad, his mum gets home, kip tells his mum he loves her, then he shoots her in the back of her head

?

Kimveer Gill 12th September 2006

Did a week's load of laundry as while as stocked up contact Len's solution and later on ate dinner in his room that day.

Another note about Kip Kinkel: He couldn't sleep or eat, but he turned on the TV (to "keep him company," not to watch.) At some point before leaving for school, he put the Romeo + Juliet soundtrack on full-volume loop.

On the day before his would-be (but aborted) rampage, Trey Sesler gets the idea to kill his family and decides to act. He asks his mom to check out his car in the garage before killing her there. His brother hears and wonders what the noise is: Trey shoots him, but he barricades himself in the bathroom. Now woken from sleep, Trey's father is killed in bed. Trey then breaks into the bathroom and repeatedly shoots his brother and rest of his family, ensuring their death. He then destroys everythink in the house from front to back, knocking over and shooting bookshelves, TVs, lights, family photographs, oven, fridge and its contents, a glass coffee table, stabbing cabinets, and killing all the family pets. At around 2AM, he calls his parents employers to calmly tell them they won't be coming in today. At some point, he scrawls regretful messages all over the house before curling up besides his mom's body and sleeps.
[Source and more details]

Devon Erickson and alec McKinney snof cocaine the day before the massacre

Elliot Rodger recorded his final “Day of Retribution” video in his car where he declared his plans to commit mass murder and explained the reasoning behind it,taking him just 6 minutes and 57 seconds.

I don't know if this is good here, but will put here anyway.
Jacob Wagner went hiking with his mother, they got lost, so they arrived home late, he goes to his room and his mother went to bed, after that he would prepar for his shooting and go to the school prom to do his shooting attack.

Hayden Jagst:
Comments on r/Offensivejokes at 12:40 AM
Comments on r/TheLeftCantMeme at 2:06 AM
Comments on r/Cannibalcorpse at 2:07 AM
Comments on r/ShitEuropeansSay at 2:09 AM
Comments on r/TheLeftCantMeme at 12:37 AM
Comments on r/marilyn_manson at 2:32
Calls Nikolas Cruz a "twisted bastard" on r/masskillers at 3:67 PM
Accessed MyAnimeList at 6:31 PM
Sends final media over discord

Jesse Osborne:
Gets yelled at by his dad

Anton Lundin Pettersson:
Watches a "shemale porn video" the day before
Puts on facepaint, black eyeliner, and glitter in his hair
Looks at his brother's Facebook
Says goodbye to an online friend
Prepares targets to help commit suicide by cop
Put his money and phone at his brother's house when he's at work

Jon Romano (all of this happened, but the exact order is somewhat speculation):
Wakes up at 8 AM
Watches the Today show and Where in the World is Matt Lauer
Showers
Had cheerios
Writes a suicide note
Answers his mom's call about making sure he was awake
Watches Bowling for Columbine
Steals his mother's car and goes to school

Alvaro Castillo:
Kills his dad
Records final video as "entertainment" for the police

Andrew Wurst:
Prepares for prom and writes a suicide note

Brahim Aouissaoui (stabber):
Goes to a mosque near the Nice train station and prayed.

Tim Kretschmer (10 march 2009) - Watched a S&M film involving a woman dominating a man the night before the attack

Bastian Bosse:
- Wrote his final journal entry

A small exerpt:

Charles Whitman (July 31st 1966)
> Bought a knife and binicoulars from a hardware store
> Bought spam from 7-Eleven convenience store
> Had Lunch with his mum at the Wyatt canteen close to the university
> Visted friends in the evening with his wife
> Started writing his suicide note

Eduardo Sencion (September 5th 2011):
- Bought 14.9 gallons of gas at around 19:24
- Took his prescribed medication before 22:00, according to his family.
- Went to Bondelines Casino at 21:58 and left the casino at 22:52, while at the casino he goes to the ATM twice, at 22:10 and 22:29 and play the Wheel of Fortune slot machines.

Scott Paul Beierle (Novermber 1st 2018):
-At around 9:13 PM, he left the hotel he was staying in (Suburban Extended Stay), went to a café and returned to the hotel at 9:50 PM

Nasim Najafi Aghdam: Drives to Mountain View, is caught by police sleeping in her car in a Walmart parking lot in Mountain View, has a "calm and cooperative" 20 minute interaction with them, goes to a shooting range.

Brenton Tarrant (March 14th 2019)

In the evening he made separate phone calls to his Mum and older sister in Australia

Gabriel Ross parker (January 22 2018)

Did the laundry, snuck a 9mm ruger handgun with 2 magazines in a basket filled with clothes from his stepfathers closet.

Chris Krumm (2012 Casper College attack): Drive across the country, checks into a room at Shiloh Inn at 3 PM the day before the attack, paying for a two night reservation with a credit card.
The day of, he killed his father's long-term girlfriend at his house before going to the college. Presumably at some point in there, be printed and deposited two copies of his manifesto at his house and the college.

Adam's Afternoon Drive On The Day Before The Shooting

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At 9:09am on the 13th of December 2012, Adam's car goes for a 20 minute drive. He drives to a cul-de-sac street in Newtown (green pin) and back, arriving home (yellow pin) at approximately 9:33am.

Source: Data recovered from Garmin GPS Recovered found in Lanza's car at Sandy Hook School.

Report 00171468, Book 2 , CFS 1200704559.

The destination seems to be very random, being a residential street with no attractions. There's no evidence of Adam having any friends/family that live there.

His route takes him past Sandy Hook Elementary School (red pin) twice. Interestingly, the route he takes is almost a mile longer than the shortest route to the destination, and he even returns on the same route without following a circular path. His trip occurs at roughly the same time he set off for the shooting the next day.

Edit: Realized the time is actually 14:09 to 14:33 zulu time, not local time. Therefore, the trip is actually in the morning between 9:09am and 9:33am.

_________________
This is the story of one fading life,
a life that couldn't be saved.
Please remember me when i'm gone.

Robert Poulin (1975 St. Pius X High School shooting):
8:00 Lures his crush to his house somewhere, handcuffs her to his bed, rapes and stabs her, at some point putting a plastic bag over her head
10:00 Talks to his mom through a curtain separating his room from the rest of the basement, mere feet away from his victim, about an optometrist appointment for him
11:00 Goes to the kitchen, mom makes him a peanut butter sandwich, watches a TV game show
11:30 His mom goes on an errand
2:00 Sets house on fire, goes on shooting spree

Micheal Andrew Clark ( Saturday April 24th 1965) - Left his house late in the night in his parents car after taking a Rifle and a Pistol from his Dads locked gun cabinet along with a large quantity of ammunition.

On Tuesday of the week of the massacre, Luiz Henrique de Castro was taken by his mother to the hospital, because he had flue, then was vaccinated with benzetacil and went to work normally.

Robert Steinhäuser:
- Met with a friend around 5pm and agreed to go to an informal graduation party after April 26th
- Watched 'The Simpsons' with this friend as well as "whatever else was on"
- At 10:30pm the friend left.

Pekka-Eric Auvinen on November 6th 2007:
-Wrote the finishing touches on his manifesto (IIRC)
-Made more YouTube videos on Sturmgeist89

these are all I remember, he probably did more stuff on the internet too

daisylee671 wrote:

kip kinkel, 20th may 1998:
-bought a stolen gun (and ammo) at school
-was spoken to by an investigator about the stolen gun, and kip admitted he had it in his locker
-he, along with the person that stole the gun, was arrested
-both were suspended from school, pending expulsion
-his dad found out and took him home from the police station
-2ish hours later, kip shot his dad in the back of the head and put his body in the bathroom
-3ish hours after he killed his dad, his mum gets home, kip tells his mum he loves her, then he shoots her in the back of her head

In his confession to Detective Al Warthen after the shooting at Thurston High. Kip said that after leaving the station but before heading home he and his Dad had stopped of at a Burger King.