Editor's note: This is the first of a two-part interview with the family of slaying victim Travis Alexander. Tuesday, Alexander’s siblings will tell In Session's Beth Karas why they believe Jodi Arias deserves the death penalty.
Travis Alexander's siblings say they both immediately suspected that Jodi Arias, their brother's former girlfriend, was involved in his murder.
Arias is charged in the 2008 slaying of Alexander, whom she used to date. She is accused of slitting his throat, shooting him in the head, and stabbing him 29 times.
Watch this video to see Steven Alexander and Tanisha Sorenson, Travis Alexander's brother and sister, talk with In Session's Beth Karas about how they found out about their brother's death.
Arias’ attorneys will be in court Tuesday for a hearing.
Arias' murder trial is scheduled to begin November 19. She claims that she killed Alexander in self-defense.
GET CAUGHT UP: Jodi Arias: Cold-blooded killer or innocent victim?
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