Local and state law enforcement search the the University of Texas campus for a possible second gunman, Sept. 28, 2010. University of Texas officials gave the all clear around 11:45am. (Reagan Hackleman/KXAN)

SWAT vehicle on the University of Texas campus (Courtesy: Israel Samario)

Crime scene tape strung at 21st Street on the University of Texas campus (Julie Karam/KXAN)

Austin Police Chief Art Acevedo talks at an afternoon press conference with updates after the morning's shooting, Sept. 28, 2010. (Erin Cargile/KXAN)

Austin police and University of Texas officials hold a press conference after the morning's shooting, Sept. 28, 2010. (Erin Cargile/KXAN)

Local and state law enforcement search the the University of Texas morning for a possible second gunman, Sept. 28, 2010. University of Texas officials gave the all clear around 11:45am. (Reagan Hackleman/KXAN)

University of Texas Public Information Officer Rhonda Weldon talks to media. (Catenya McHenry/KXAN)

SWAT officers in McCombs School of Business (Courtesy: Santiago Samario)

Local and state law enforcement search the the University of Texas campus for a possible second gunman, Sept. 28, 2010. University of Texas officials gave the all clear around 11:45am. (Reagan Hackleman/KXAN)

Scene overhead from Dobie Hall, looking over the scene at Whitis and 21st streets (Courtesy to KXAN: Mariah Kemp)

University of Texas officials and law enforcement agencies hold a press conference just after noon on the day of the campus shooting, Sept. 28, 2010. (Todd Bynum/KXAN)

Outside the PCL (Leslie Rangel/KXAN)

Response to the shooting on the University of Texas campus included a SWAT armored personnel vehicle. (Courtesy to KXAN: Skylar Moran)

Outside the PCL (Leslie Rangel/KXAN)

University of Texas officials and police hold a press conference the afternoon of the campus shooting, Sept. 28, 2010. (Todd Bynum/KXAN)

Local and state law enforcement search the the University of Texas campus for a possible second gunman, Sept. 28, 2010. University of Texas officials gave the all clear around 11:45am. (Reagan Hackleman/KXAN)

A police officer searches a building on the University of Texas campus for a possible second gunman, Sept. 20, 2010. University of Texas officials gave the all clear around 11:45am. (Reagan Hackleman/KXAN)
 

Local and state law enforcement search the the University of Texas campus for a possible second gunman, Sept. 28, 2010. University of Texas officials gave the all clear around 11:45am. (Reagan Hackleman/KXAN)

Police on the UT campus (Reagan Hackelman/KXAN)

Local and state law enforcement search the the University of Texas campus for a possible second gunman, Sept. 28, 2010. University of Texas officials gave the all clear around 11:45am. (Reagan Hackleman/KXAN)

Local and state law enforcement search the the University of Texas campus for a possible second gunman, Sept. 28, 2010. University of Texas officials gave the all clear around 11:45am. (Reagan Hackleman/KXAN)

Austin police monitor the perimeter lockdown area of the University of Texas campus. (Frank Martinez/KXAN)

A police canine unit searches the UT campus for evidence. (Catenya McHenry/KXAN)

Police check Mezes Hall on the UT campus, Austin, Sept. 28, 2010. (Courtesy to KXAN: Spencer Raley)

Canine police unit sweeps the area looking for evidence on the UT campus, Sept. 28, 2010 (Todd Bynum/KXAN)

SWAT officers on the University of Texas campus, Sept. 28, 2010 (Courtesy to KXAN: Deanna Shahady)

A lone bicyclist rides away from Welch Hall on the UT campus after its evacuation. (Julie Karam/KXAN)

Hundreds of students and staff were told to walk down the campus speedway, away from the PCL.

Police have cleared the campus streets. (Catenya McHenry/KXAN)

Students in a UT classroom watching KXAN Austin News coverage of the shooting event, Sept. 28, 2010 (Courtesy: Jiimmy Dushku)

University of Texas students leaving via Jester Hall, a dormitory, which is across the street from PCL. Police had students stand there while they checked the building, Sept. 28, 2010 (Courtesy to KXAN: James Furlong)

University of Texas President Bill Powers talks to media, Sept. 28, 2010, giving updates on the campus shooting. (Catenya McHenry/KXAN)

Austin Mayor Lee Leffingwell, right, with University of Texas President Bill Powers, center, conduct a press conference about the shooting incident in the Perry-Castenada Library on campus, Sept. 28, 2010. (Catenya McHenry/KXAN)

Austin Police Chief Art Acevedo, right, talks with media, along with University of Texas President Bill Powers, left, and another officer, Sept. 28, 2010. (Catenya McHenry/KXAN)

Austin Police Chief Art Acevedo, right, and other officials talk to media at the UT campus, Sept. 28, 2010. (Catenya McHenry/KXAN)

Austin Police Department (Kate Weidaw/KXAN)

UT students were asked to exit with their hands up. (Chris Sadeghi/KXAN)

Scene outside the Perry-Castenada Library (Courtesy: Emmanuel Winston)

Oscar Trevino, father of a UT student, talks with news crews about how his daughter said the gunman was behind her. (Rhonda Lee/KXAN)

Map of the Perry-Castenada Library on UT campus

Reports of an armed individual Tuesday morning have MLK and San Jacinto boulevards blocked off (Candra McGee)

Reports of an armed person inside a library at the University of Texas campus have everyone on high alert (Kate Weidaw/KXAN)

Armored SWAT trucks arrive at UT campus as authorities seek an armed suspect on campus. (Catenya McHenry/KXAN)

Students released from Welch Hall (Chris Sadeghi/KXAN)

SWAT police on UT campus as authorities seek second armed suspect. (Chris Sadeghi/KXAN)

Helicopters in the sky over the University of Texas-Austin (Chris Sadeghi/KXAN)

MLK Avenue shut down in front of campus as authorities look for armed suspect (Rhonda Lee/KXAN)

Police respond to the gunman at UT (Catenya McHenry/KXAN)

SWAT teams inside the McCombs School of Business (Courtesy: Emmanuel Wilson)

University of Texas campus is crowded with law enforcement as they search for a second suspect (Catenya McHenry/KXAN)

University of Texas campus is crowded with law enforcement as they search for a second suspect (Catenya McHenry/KXAN)

University of Texas campus is crowded with law enforcement as they search for a second suspect (Catenya McHenry/KXAN)