48 Hours's video: Sneak peek: The Murder of Anna Repkina

Did a love triangle lead to murder? After his fiancée is found dead, a man researches time travel to "correct a horrible mistake." Correspondent Tracy Smith reports in an all-new "48 Hours" airing Saturday, October 31 at 10/9c on CBS. Subscribe to the “48 Hours" Channel HERE: http://bit.ly/1DvRWbT Watch Full Episodes Of "48 Hours" HERE: http://bit.ly/1fop6N1 Investigate with "48 Hours: Crimesider" HERE: http://cbsn.ws/20pdMsu Follow “48 Hours” on Instagram HERE: http://bit.ly/1OLG2B9 Like "48 Hours" on Facebook HERE: http://on.fb.me/1KkQuRn Follow "48 Hours" on Twitter HERE: http://bit.ly/1MOCAXf Follow "48 Hours" on Google+ HERE: http://bit.ly/1HqF6Mr Listen to “48 Hours” Podcasts HERE: http://bit.ly/1h0fPUg Get the latest news and best in original reporting from CBS News delivered to your inbox. Subscribe to newsletters HERE: http://cbsn.ws/1RqHw7T Get your news on the go! Download CBS News mobile apps HERE: http://cbsn.ws/1Xb1WC8 Get new episodes of shows you love across devices the next day, stream local news live, and watch full seasons of CBS fan favorites anytime, anywhere with CBS All Access. Try it free! http://bit.ly/1OQA29B --- "48 Hours" investigates the most intriguing crime and justice cases that touch on all areas of the human experience including greed and passion. For 27 seasons, "48 Hours" has developed a rich history of original reporting and impact journalism that has helped exonerate wrongly convicted people, caused cold cases to be reopened and solved, and along the way changed lives. Check local listings for "48 Hours" broadcast times.