Salt Lake City , Utah ( CNN ) -- The jury began deliberations Thursday in the trial of Brian David Mitchell , accused of kidnapping 14-year-old Elizabeth Smart in 2002 . The jurors will decide whether Mitchell , 57 , was legally insane when he snatched Smart at knifepoint from her bedroom on June 5 , 2002 . Smart testified at the monthlong trial that he led her to a makeshift camp in the canyons above her home , `` sealed '' her as his spiritual plural wife and raped her . U.S. District Dale Kimball instructed jurors that in order to acquit Mitchell under the insanity defense , they must determine he was mentally ill and that his illness was so severe it kept him from knowing right from wrong . Defense attorneys mounted the insanity defense for Mitchell , trying to convince jurors that Mitchell was so delusional he could not understand his actions were wrong when he abducted Smart . Several mental health experts testified for the defense , offering diagnoses that ranged from delusional to psychotic to paranoid schizophrenic . When a defendant acts out in court . Prosecutors produced their own mental health experts , who testified that Mitchell was little more than a narcissistic pedophile who used religious dogma and claims he received revelations from God to get what he wanted . Smart spent nine months with Mitchell and his legal wife , Wanda Barzee , at makeshift camps in the Utah mountains and at a homeless camp outside San Diego , California . Now 23 , Smart was the star witness for the prosecution . She said Mitchell raped her nearly every day of her captivity , some days more than once . She initially was kept tethered between two trees and treated `` like an animal , '' she testified . Later , she was allowed to accompany Mitchell and Barzee into town , but was forced to wear flowing religious robes and a veil . She was not permitted to speak to other people , she said . Mitchell claimed to be a prophet named Immanuel David Isaiah , who would take 49 wifes and battle the Antichrist in the end times . Afterward , his family would hold exalted positions in the new kingdom . Smart said her job was to teach the new wives how to perform sexually . She said Mitchell claimed she was preordained to be his wife but never spoke of his destiny with outsiders . Many times , she said , he used his revelations to justify drinking , smoking or viewing pornography . Mitchell , Smart and Barzee were stopped by police in Sandy , Utah , on March 12 , 2003 . Smart was reunited with her family , and Mitchell and Barzee were charged by state authorities . When those cases bogged down over whether they were mentally competent to stand trial , the case moved to federal court . Barzee , 64 , reached a plea bargain and is serving 15 years in prison . She testified for the defense and described Mitchell as a manipulator who took advantage of her religious beliefs . CNN 's Lena Jakobsson and Ann O'Neill contributed to this report .
Defense and prosecution have rested their case in the trial of actor David Mitchell . Jury will decide if Mitchell 's mental illness kept him from knowing right from wrong . Defense said Mitchell is so delusional that he could not understand his actions . Defense cited mental health experts who said Mitchell knew his actions were wrong .