Here are the attacks that police believe are the work of a serial rapist:

? On July 14, 2004, an unidentified man entered a southwest Lawrence apartment and raped a Kansas University student, who was between 20 and 25 years old, who was sleeping.

? On Dec. 29, 2004, two women, ages 19 and 20, were raped inside an apartment at Highpointe Apartments in the 2000 block of West Sixth Street.

? On June 13, 2006, an unidentified man entered a central Lawrence home and raped a 21-year-old woman.

? On March 22, 2008, an unidentified man entered an apartment at Lorimar Townhomes, 3801 Clinton Parkway, and sexually assaulted a 20-year-old Kansas University student.

? On Dec. 1, 2008, a 19-year-old woman was raped by an unidentified male who entered her southwest Lawrence home with a handgun at 2 a.m.