RIVERSIDE (AP) — A dozen people were killed and 58 others were wounded when a gunman opened fire during the midnight viewing of the new Batman movie “The Dark Knight Rises.”

Police in Aurora, Colorado arrested a suspect, 24-year-old James Holmes. Here’s a basic timeline for suspected Colorado theatre gunman.

Dec. 13, 1987: Born in San Diego County, California.

Parents: Robert Milton Holmes and Arlene Rosemary Holmes.

2006: Graduated from Westview High School, Class of 2006, according to Dr. John Collins, Superintendent of the Poway Unified School District.

2006 – 2010: Attended the University of California, Riverside, graduating with a BS in neuroscience in spring 2010. Chancellor Timothy P. White said Holmes graduated with honors.

2011: Holmes enrolled in the Ph.D. neuroscience program at the University of Colorado-Denver, said spokeswoman Jacque Montgomery.

May 2011: An Address of 1690 Paris Street, Aurora, Colo., for James Holmes shows up in public records searches.

July 20, 2012: Montgomery said Holmes “was in the process of withdrawing” from graduate school. The school said in a statement later that Holmes was a student there until early June 2012.

(© Copyright 2012 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)