• Jan. 9, 1968: Kenton Drew Astin is born Jerry Buckley.

• Unknown date: Jerry Buckley begins using the name Sin Metri.

• July 9, 1999: Buckley legally changes his name to Kenton Drew Astin.

• March 31, 2001: Astin stabs Dylan Trembley at the Salvation Army store in Longmont, then tells police his name is Dylan Klebold, the name of one of the Columbine gunmen.

• Sept. 21, 2001: Astin is found not guilty by reason of insanity and committed to the Colorado Mental Health Institute at Pueblo.

• 2004: An assessment finds that Astin is at "moderate risk to violently reoffend."

• Oct. 25, 2005: The Colorado Department of Human Services places Astin in a halfway house in Boulder.

• Oct. 10, 2006: Astin is hired as a cashier at the Alferd Packer Grill on the University of Colorado's Boulder campus.

• Nov. 21, 2006: Steve Schoenmakers, superintendent of the state hospital, concludes that Astin is no longer dangerous and asks for his "conditional release."

• Jan. 23, 2007: Boulder County District Attorney Mary Lacy opposes Astin's release, noting that he has not had a risk assessment since 2004.

• Feb. 26, 2007: A new risk assessment is conducted and finds that Astin is a "low risk to engage in violent recidivism."

• March 20, 2007: Lacy's office drops her opposition to the release.

• April 6, 2007: A judge grants Astin's release.

• April 10, 2007: Astin's job at CU ends.

• Monday: Astin allegedly stabs a CU freshman, then himself, on campus.