On October 18, 2010, jury selection commenced in the Superior Court of the District of Columbia before Judge Gerald I. Fisher. Assistant U.S. Attorney Fernando Campoamor-Sanchez presented the names of potential witnesses for the trial, including FBI agent Brad Garrett and the two women whom Guandique was convicted of assaulting. At the start of the trial, the prosecution's case was expected to take around four weeks and the defense was expected to take one day. On October 25 and 26, Halle Shilling and Christy Wiegand testified about being attacked by Guandique while independently jogging in Rock Creek Park. Wiegand recounted that Guandique grabbed her from behind, dragged her down a ravine and held a knife against her face.