The gunman who killed a deputy and injured four other officers after firing 100 rounds during a horrific 'ambush attack' in Colorado live streamed the incident as officials at a former college he attended revealed his history of erratic behavior.
Periscope footage from the Highlands Ranch apartment of Matthew Riehl, 37, reveals him screaming early Sunday in a dark room while telling officers, 'go away, go away! Don't come in! I've warned you. Identify... What's your name?' as several shots are fired.
'Get the f**k outta here! Get out! Leave me alone! Why are you here? You don't have a warrant,' Riehl shouted.
Deputy Zackari Parrish, 29, was shot dead while responding to a verbal disturbance call by Riehl around 5:15am from the apartment.
Deputy Mike Doyle, 28, Deputy Taylor Davis, 30, Deputy Jeffrey Pelle, 32, - all of the Douglas County Sheriff's Office - and 41-year-old Castle Rock Police Officer Tom O'Donnell were injured.
Douglas County Sheriff Tony Spurlock revealed at a press conference Sunday that all of the remaining officers are in stable condition.
Authorities had publicly identified Riehl - who was shot dead by the joint task force unit.
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Matthew Riehl, 37, was identified as the gunman who allegedly killed one deputy and injured four others in the Sunday shooting
Deputy Zackari Parrish, 29 (pictured) was shot and killed while responding to a verbal disturbance at an apartment complex near Denver. He is survived by his wife and two young daughters
The shooter is shown live-streaming the moments before he fired 100 bullets at cops killing one and injuring four others
He called 911 before the group of deputies arrived and the deadly altercation went down
In the recorded altercation, he continues to yell: 'Go away! Leave me alone! Go! Get out! (shots fired) They broke my door! They broke my door! They broke my door!' he repeats.
'Why, why, why?! he screamed. 'Leave me alone,' he is finally heard saying in the clip.
Riehl, an Iraq war veteran, posted a YouTube clip earlier this month claiming he was trying to unseat his local sheriff.
In another video the gunman posted on Periscope in hour before the killing, he is shown rambling as he chugs scotch.
Riehl curses and spews details about his roommate following a fight the two allegedly had.
'I thought we were lovers ... are you kicking me out?' he seemingly asks, although is was confirmed his roommate was not home at the time.
'I'm sorry, maybe I bought over 1,000 rounds of ammunition at Walmart. It's not illegal. So if anybody bothers me, that's why I've have a couple scotches,' he said after.
Then, he called 911.
Just two weeks ago, Riehl (left and right), recorded himself ranting about one of the Douglas County Sheriff's deputies, Brian Briggs. In the bizarre YouTube video, Riehl can be seen holding up Briggs' business card as he calls him a 'pimp' multiple times
He told the dispatcher: 'This guy invited me to his house and it was time to move in and he like, totally freaked out on me.
'He was comin' at me ... and OK, I'm worried about his health. He didn't know what year it was,' he rambles on in the confusing video.
'He kept coming at me, and I put a laser in his eye ... for my health and safety. I do have some weapons. I own firearms. You know, I've had some scotch.
'I've been on my Periscope just doing my thing, I'm not hear to hurt anybody,' he laughs lightly. 'But yes, I do have firearms.'
Riehl is then seen walking out of the room as the Douglas County Sheriff's deputies arrive.
The deputies enter the home and one says, 'are you OK?' and Riehl responds, 'Well, I want to file a domestic restraining order against my domestic partner.'
An officer is heard telling Riehl he can help him when he asks, while the officer adds, 'I just feel like you're really upset' as Riehl rambles further.
Sheriff Spurlock said the officers responded to a call that came in as a domestic dispute but was quickly revealed to be a verbal dispute between the shooter and his roommate.
It was the second time deputies had gone to the apartment Sunday.
There was another call at about 1:30am but there was no noise when deputies arrived.
The four - aside from Parrish (pictured with and two young daughters) - were able to crawl to safety while a separate joint task force unit entered the apartment and eventually shot and killed the suspect
Four other deputies were shot. They include 28-year-old Deputy Mike Doyle (left), 30-year-old Deputy Taylor Davis, 32-year-old Deputy Jeffrey Pelle - all of the Douglas County Sheriff's Office - and 41-year-old Castle Rock Police Officer Tom O'Donnell (right)
Deputy Jeffrey Pelle (left), son of Boulder County Sheriff Joe Pelle, was confirmed as one of the deputies shot this morning, according to the Boulder County Sheriff’s Office
After being let in, and confronting the suspect, who had barricaded himself in a bedroom, the officers were almost immediately met with fire.
The sheriff said there is no timeline available yet as to who was shot first but that all of them were shot 'very very quickly and all went down within seconds of other'.
The four were able to crawl to safety while a separate joint task force unit entered the apartment and eventually shot and killed Riehl.
Authorities said the roommate, who was home, was not injured and the two civilians were not inside the apartment.
Two civilians were also shot by the suspect, but sustained non-life-threatening injuries.
They have not been identified.
Police are treating the event as a 'mental health response,' according to 9 News.
It seems students at Wyoming College of Law in Laramie had previously warned police about Riehl - a former student - after he published similar posts about professors, according to KTWO-AM.
In November, Assistant College of Law Dean Lindsay Hoyt told students in an email to inform campus police if they sighted Riehl, while the school amped up security for days.
Officers at the campus even went so far as to call law enforcement in Lone Tree, Colorado to warn of his concerning social media talks that reflected that of a mentally-ill person, UW Police Chief Mike Samp said in a statement to The Denver Post.
A line of police cars left Littleton Adventist Hospital (pictured) and traveled along Colorado State Highway 470 led by two officers on motorcycles
A procession of police vehicles escorts the hearse carrying the body of Parrish, who was killed on Sunday morning.
Just two weeks ago, Riehl, also recorded himself ranting about one of the Douglas County Sheriff's deputies,