The Washington Post:

"...Corkins had been volunteering at a U Street NW community center for gay, lesbian, bisexual and transgender people, according to officials there.

... Allan P. Chan, 28, a former George Mason student, said he met Corkins at a campus gym about six years ago. They worked out together, lifting weights, and began to socialize and watch television together. Chan described Corkins as secretive and somewhat odd. Corkins’s Facebook page included no photos, not even his own, and he displayed an intense interest in the 19th-century German philosopher Friedrich Nietzsche.

“He was a fanatic of Nietzsche,” Chan said.

... In the lobby, the intruder began “making statements” in opposition to the Family Research Council’s social conservatism, a law enforcement official said."