Floyd Lee Corkins II was accused of shooting a security guard inside the Family Research Council’s headquarters building in August. (Washington Blade file photo by Michael Key)

A Herndon, Va., man arrested last August for shooting an unarmed security guard in the lobby of the anti-gay Family Research Council headquarters in downtown Washington pleaded guilty on Wednesday to three felony charges, including the charge of committing an act of terrorism while armed.

Floyd Lee Corkins II, 28, who has been held in jail since his arrest last August, signed a charging document before appearing in court on Wednesday confirming that he intended to commit a mass killing at the FRC building, a federal prosecutor said in court.

“[C]orkins targeted the Family Research Council because of its political views, including its advocacy against recognition of gay marriage,” according to a statement released Wednesday by the U.S. Attorney’s office.

“He entered the building with the intention of shooting and killing as many employees of the organization as he could,” the statement says.

The wounded security guard has been credited by D.C. police and the FBI with saving the lives of FRC employees working on the building’s upper floors by wrestling Corkins to the floor and taking away the semi-automatic handgun Corkins wielded while attempting to gain access to the elevator.

The guard suffered a gunshot wound to the arm and has undergone several rounds of surgery in connection with the injury.

In addition to the terrorism charge, Corkins pleaded guilty to charges of assault with intent to kill while armed and interstate transportation of a firearm and ammunition. He faces a potential maximum sentence of 70 years in prison.

U.S. District Court Judge Richard W. Roberts scheduled a sentencing hearing for April 29.

Corkins, who worked for a short time as a volunteer at D.C.’s LGBT Community Center in 2011, has not disclosed his sexual orientation.

In new information released this week, the U.S. Attorney’s office said police and FBI agents investigating the case found a handwritten list on Corkins’ possession containing the names of the Family Research Council and “three other organizations that openly identify themselves as having socially conservative agenda.” The U.S. Attorney’s office didn’t identify the other organizations, saying only that Corkins intended to target them had he succeeded in his planned shooting at the FRC.

Prosecutors also disclosed for the first time that Corkins returned to a gun store in Virginia where he purchased the gun on the night before he arrived at the FRC building and engaged in shooting practice.

Authorities previously disclosed that they had discovered in Corkins’ backpack a box of 50 rounds of 9 mm ammunition and 15 individually wrapped sandwiches he bought the previous day from Chik-fil-A.

In the statement released on Wednesday, the U.S. Attorney’s office disclosed that Corkins told FBI agents interviewing him after his arrest that he planned to “smother the Chick-fil-A sandwiches” into the faces of the FRC employees he intended to shoot.

In a separate court filing last week, prosecutors disclosed that they searched of Corkins’ family computer at the Herndon home where he lived with his parents. The computer search showed that he apparently obtained the list of socially conservative groups he planned to target, including the FRC, from the website of the Southern Poverty Law Center.

SPLC has listed FRC as a hate group based, among other things, on its portrayal of homosexuality and gay people as being associated with pedophilia.

In a statement released on Wednesday, FRC President Tony Perkins reiterated his earlier assertion that Southern Poverty Law Center was responsible for creating a climate that led to someone like Corkins seeking to commit violence.

“[I] stated that while Corkins was responsible for the shooting, he had been given a license to perpetrate this act of violence by groups like the Southern Poverty Law Center which has systematically and recklessly labeled every organization with which they disagree as a ‘hate group,’” Perkins said.

Southern Poverty Law Center officials have denounced Perkins for misrepresenting their position, saying they never label an organization as a hate group based on political views or public policy positions. SPLC officials have said they list FRC as a hate group for what they say are its false and defamatory claims linking homosexuality and LGBT people to pedophilia.