What we know about Chris Harper Mercer

After nine people were killed and seven people wounded on the campus of Umpqua Community College, the gunman was idendified as Chris Harper-Mercer. Here's what we know about the 26-year-old:

- The U.S. Army says the gunman flunked out of basic training in 2008. Lt. Col. Ben Garrett said Christopher Sean Harper-Mercer was in service at Fort Jackson, South Carolina, starting on Nov. 5, 2008. But by Dec. 11, 2008, he was discharged for failing to meet minimum administrative standards. Garrett did not say which standards Harper-Mercer failed to meet.

- The 26-year-old lived in an apartment complex in Winchester. A neighbor, Bronte Harte said Mercer "seemed really unfriendly" and would "sit by himself in the dark in the balcony with this little light."

- Officials say Mercer was enrolled in the class where the shooting took place. Investigators earlier had believed he may have been a student at the college because a receipt found at the scene showed he purchased textbooks from the campus bookstore two days before the shooting, the ATF said.

- A student who worked on stage productions with the gunman says he was a normal guy, if a bit nerdy. Alex Frier, stage manager for plays at Umpqua Community College, says Mercer was a production assistant responsible for building sets last semester. (It wasn't clear if he was enrolled at the college in the small town of Roseburg, but she and some students say they thought he was taking classes.)

- Social profiles linked to Mercer suggested he was fascinated by the IRA, frustrated by traditional organized religion and tracked other mass shootings. There didn't seem to be many recent connections on the social media sites linked to Mercer, with his MySpace page just showing two friends.

- In addition to the MySpace page (pictured, right), Mercer appeared to have at least one online dating profile, a torrents streaming account and a blog.

- Mercer previously lived in the Los Angeles-area suburb of Torrance with his mother.

- His father, Ian Mercer, said late Thursday that it's been a "devastating day" for him and his family, and he has been talking to police and the FBI about the shooting. He spoke to KABC-TV and several other media outlets gathered outside his house in Tarzana, California.

- CBS Los Angeles reported Mercer had ties to the Los Angeles-area communities of Torrance and Tarzana. Mercer's stepsister told the station he was born in England and traveled to the United States as a young boy.

- Federal investigators recovered six weapons at the college and seven at Mercer's apartment. All of the weapons were purchased legally, seven of them by the shooter or his family members in the last three years, Celinez Nunez, the Bureau of Alcohol, Tobacco, Firearms and Explosives assistant special agent in charge, said at a news conference Friday.