NATIONAL NEWS (CNN) — At the I.V. Deli Mart in Isla Vista, California, purple flowers now fill a bullet hole in the front of the store.
It's just one of at least 10 crime scenes left behind by a young man bent on wreaking havoc because of his perceived slights and his difficulties with women.
In the three days since the stabbing and shooting spree that left six people and the assailant dead, a slew of new information has emerged about the victims, the suspect and what led up to the tragedy. Here's what we know:
The rampage started with his roommates
Authorities now know Elliot Rodger's cross-town killing spree began before he even left home.
The 22-year-old former Santa Barbara City College student fatally stabbed three young men in his own apartment -- George Chen, 19, Cheng Yuan Hong, 20, and Weihan Wang, 20.
Chen and Hong were the attacker's roommates.
A friend of Rodger's family said Rodger recently had a feud with his roommates, complained to his landlord that his roommates were too noisy and played lots of video games.
The assailant himself outlined his plan to kill two roommates in a 137-page manifesto he left behind.
"I'd even enjoy stabbing them both to death while they slept," Rodger wrote.
The assailant had been seeing therapists
Rodger's history of mental health issues was no secret to his family, and the young man was seeing at least two therapists prior to his death.
He had been seeing therapists on and off since he was 8, family friend Simon Astaire said. When he went to high school in Van Nuys, California, he met with a therapist "pretty much every day," Astaire said.
Rodger's family contacted police after discovering social media posts about suicide and killing people, family spokesman and attorney Alan Shifman told reporters Saturday.
Six policemen showed up at Rodger's home in Isla Vista on April 30, but they found nothing alarming. So they told Rodger to call his mother and they reassured her that he was OK, according to Astaire.
Santa Barbara County Sheriff Bill Brown told reporters Saturday that at the time, deputies "determined he did not meet the criteria for an involuntary hold."
Brown said Rodger told deputies it was a misunderstanding and that he was not going to hurt anyone or himself. Rodger said he was having troubles with his social life.
But even then, Rodger was already plotting his deadly "Day of Retribution."
"I had the striking and devastating fear that someone had somehow discovered what I was planning to do, and reported me for it," Rodger wrote toward the end of a 137-page account of his life. "If that was the case, the police would have searched my room, found all of my guns and weapons, along with my writings about what I plan to do with them.
"I would have been thrown in jail, denied of the chance to exact revenge on my enemies. I can't imagine a hell darker than that."
He sent his manifesto to two dozen people
Perhaps some of the most obvious clues as to why the rampage took place come from Rodger's 137-page manifesto, which chronicles his birth all the way to his planned "Day of Retribution."
Minutes before he shot three young women in front of sorority house and killed a young man at a nearby deli, Rodger e-mailed his dissertation -- "My Twisted World: The Story of Elliot Rodger" -- to two dozen people, including his parents and at least one of his therapists.
"My orchestration of the Day of Retribution is my attempt to do everything, in my power, to destroy everything I cannot have," Rodger wrote.
"All of those beautiful girls I've desired so much in my life, but can never have because they despise and loathe me, I will destroy. All of those popular people who live hedonistic lives of pleasure, I will destroy, because they never accepted me as one of them. I will kill them all and make them suffer, just as they have made me suffer. It is only fair."
Rodger's mother, Lichin, saw the e-mailed manifesto at 9:17 p.m. PT. She went to Rodger's YouTube page and saw a disturbing video in which her son talked about "slaughtering" women at a sorority house at the University of California at Santa Barbara, Astaire said.
His mother called 911 and Rodger's father, and the parents left from Los Angeles to Santa Barbara, the family friend said. En route, they heard there was a shooting. Later that night, they found out their son was the gunman.
All the deceased victims were students
Chen, Hong and Wang, the three young men who were stabbed to death in Rodger's apartment, were students at the University of California, Santa Barbara.
The two young women fatally shot outside the Alpha Phi sorority house -- Katherine Cooper, 22, and Veronika Weiss, 19 -- were also UCSB students. They were members of the Delta Delta Delta sorority.
"Katie will be remembered for her generous spirit and warm heart. Veronika will be remembered for her vibrant personality and enthusiasm for life," Delta Delta Delta President Phyllis Durbin Grissom wrote.
The sixth victim killed was Christopher Martinez, a 20-year-old UCSB student known for his selflessness.
Jeff Dolphin, his freshman-year roommate, remembered how Martinez often prioritized others before himself.
"Chris was just an amazing guy," Dolphin told the Los Angeles Times. "If I was going through something, he was always there for me. If I needed something, he was there. If I needed a textbook, if I was locked out of the room because I forgot my key, he would stop playing basketball or doing what he was doing to unlock the door so I didn't have to get charged. He was just a great guy."
-- CNN's Todd Leopold, Chelsea J. Carter, Ashley Fantz, Steve Almasy and Joe Sutton contributed to this report.