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A knife is collected for evidence outside Spring High School Wednesday, Sept. 4, 2013, in Spring, Texas. At least one person has been killed and others injured in an altercation at the high school in suburban Houston. The Harris County Sheriff's Office did not say whether the people involved in the fight about 7 a.m. Wednesday at Spring High School were all students. (AP Photo/David J. Phillip) ( APTOPIX High School Stabbing )

Laurie Garza talks on the phone as she waits for her daughter outside Spring High School Wednesday, Sept. 4, 2013, in Spring, Texas. (AP Photo/David J. Phillip) ( High School Stabbing )

Emergency personnel remove a person from the school after at least one person was killed and others were injured during an altercation inside Spring High School Wednesday, Sept. 4, 2013, morning in Spring, Texas.(AP Photo/The Houston Chronicle, Mayra Beltran ) ( High School Stabbing )

Carrie Estrada, right, and Mindy Weaver, second from right, wait for their children outside Spring High School Wednesday, Sept. 4, 2013, in Spring, Texas. (AP Photo/David J. Phillip) ( High School Stabbing )

Nekita Smith waits for her son outside Spring High School Wednesday, Sept. 4, 2013, in Spring, Texas. (AP Photo/David J. Phillip) ( High School Stabbing )

People gather in prayer across the street from Spring High School Wednesday, Sept. 4, 2013, in Spring, Texas. (AP Photo/David J. Phillip) ( High School Stabbing )

Law enforcement officers gather outside Spring High School Wednesday, Sept. 4, 2013, in Spring, Texas. (AP Photo/David J. Phillip) ( High School Stabbing )

A concerned family member waits for students to be released after at least one person was killed and others were injured during an altercation inside Spring High School Wednesday, Sept. 4, 2013, morning in Spring, Texas. (AP Photo/The Houston Chronicle, Mayra Beltran ) ( High School Stabbing )

Veronica Gonzalez, right, puts her head on the shoulder of her husband, Walter Gonzalez, as they pray while waiting for their daughter and niece outside Spring High School, Wednesday, Sept. 4, 2013, in Spring, Texas. (AP Photo/David J. Phillip) ( High School Stabbing )

A woman, who did not wish to be identified, is consoled after hearing the name of the victim as she waits across the street from Spring High School Wednesday, Sept. 4, 2013, in Spring, Texas. (AP Photo/David J. Phillip) ( High School Stabbing )

Adults wait outside Spring High School after at least one person was killed and others injured during an altercation inside the school Wednesday, Sept. 4, 2013, in Spring, Texas. (AP Photo/The Houston Chronicle, Mayra Beltran ) ( High School Stabbing )

Parents and family members pray after at least one person was killed and others injured during a fight inside Spring High School Wednesday, Sept. 4, 2013, morning in Spring, Texas. (AP Photo/The Houston Chronicle, Mayra Beltran ) ( High School Stabbing )

A Harris County Sheriff's Deputy stands outside Spring High School Wednesday, Sept. 4, 2013, in Spring, Texas. (AP Photo/David J. Phillip) ( High School Stabbing )

Spring Independent School District Police try to comfort a woman after a fatal stabbing at Spring High School September 4, 2013 in Spring, Texas. A 17-year-old student was fatally stabbed and three other students during what has been reported as a fight at the school about 7:00 am. Three people have been taken into custody. (Photo by Thomas B. Shea/Getty Images) ( 179496054 )

Spring Independent School District Police officer talks to a parent after a stabbing at Spring High School September 4, 2013 in Spring, Texas. (Photo by Thomas B. Shea/Getty Images) ( 179496058 )

Spring Independent School District Police take a person into custody on the grounds of Spring High School September 4, 2013 in Spring, Texas. (Photo by Thomas B. Shea/Getty Images) ( 179496065 )

Spring independent School District Police take a person into custody on the grounds of Spring High School September 4, 2013 in Spring, Texas. (Photo by Thomas B. Shea/Getty Images) ( 179496066 )

Spring High School Senior Amanda Hasty tries to call her parents after a stabbing at Spring High School September 4, 2013 in Spring, Texas. (Photo by Thomas B. Shea/Getty Images) ( 179496069 )

A Harris County Sheriff arrests a person on the grounds of Spring High School September 4, 2013 in Spring, Texas. (Photo by Thomas B. Shea/Getty Images) ( 179496070 )

Teachers and staff watch from inside Spring High School after a stabbing September 4, 2013 in Spring, Texas. (Photo by Thomas B. Shea/Getty Images) ( 179496251 )

A Harris County Sheriff takes a person into custody on the grounds of Spring High School September 4, 2013 in Spring, Texas. (Photo by Thomas B. Shea/Getty Images) ( 179496279 )

A Harris County Sheriff takes a person into custody on the grounds of Spring High School September 4, 2013 in Spring, Texas. (Photo by Thomas B. Shea/Getty Images) ( 179496452 )

A Harris County Sheriff takes a person into custody on the grounds of Spring High School September 4, 2013 in Spring, Texas. (Photo by Thomas B. Shea/Getty Images) ( 179496457 )

Spring High School parents wait across the street from Spring High School for their children to be released from a lockdown after a stabbing at the school September 4, 2013 in Spring, Texas. (Photo by Thomas B. Shea/Getty Images) ( 179496464 )

Katherine Womack who has two grandchildren attending Spring High School, tries to talk to an officer after a stabbing at Spring High School September 4, 2013 in Spring, Texas. (Photo by Thomas B. Shea/Getty Images) ( 179496467 )

Joel Eisenbruse, John Cordey , Rosemary Alyea and Michelle Cress, with the Trinity Church outreach, pray at the scene of a stabbing at Spring High School September 4, 2013 in Spring, Texas. (Photo by Thomas B. Shea/Getty Images) ( 179496476 )

Police stand in front of Spring High School after a stabbing September 4, 2013 in Spring, Texas. (Photo by Thomas B. Shea/Getty Images) ( 179496481 )

Lora Ross, left, hugs her son Jonathan Ross outside Spring High School Wednesday, Sept. 4, 2013, in Spring, Texas. Students were dismissed after a 17-year-old student was stabbed to death and three others were injured in a fight at the Houston-area high school. (AP Photo/David J. Phillip) ( High School Stabbing )

A law enforcement officer explains how parents can pickup their children outside Spring High School Wednesday, Sept. 4, 2013, in Spring, Texas, after 17-year-old student was stabbed to death and three others were injured after a fight at the Houston-area high school.(AP Photo/David J. Phillip) ( High School Stabbing )

A woman looks out a school bus as it leaves Spring High School Wednesday, Sept. 4, 2013, in Spring, Texas. (AP Photo/David J. Phillip) ( APTOPIX High School Stabbing )

Students are loaded onto a bus outside Spring High School Wednesday, Sept. 4, 2013, in Spring, Texas. (AP Photo/David J. Phillip) ( High School Stabbing )

A Spring ISD police officer talks to parents outside Spring High School after at least one person was killed and others were injured during an altercation inside Spring High School Wednesday, Sept. 4, 2013, morning in Spring, Texas. The stabbing happened about 7 a.m. on the campus at 19428 North Freeway, according to the Harris County Sheriff's Office. (AP Photo/Houston Chronicle, Melissa Phillip) ( High School Stabbing )

Students walk to their waiting parents outside Spring High School Wednesday, Sept. 4, 2013, in Spring, Texas. (AP Photo/David J. Phillip) ( High School Stabbing )

Students wait to leave Spring High School Wednesday, Sept. 4, 2013, in Spring, Texas. (AP Photo/David J. Phillip) ( High School Stabbing )

Family members of a student victim with Pastor E.A. Deckard, center, answer questions about the victim involved in the Spring, Texas High School stabbing that left a 17-year-old dead and three others injured, Wednesday, Sept. 4, 2013 in Spring, Texas. (AP Photo/Houston Chronicle, Cody Duty) ( High School Stabbing )

Students point to their waiting parents outside Spring High School Wednesday, Sept. 4, 2013, in Spring, Texas. (AP Photo/David J. Phillip) ( High School Stabbing )