On the evening of December 27, 2011, Russ Faria came home to his house in Troy, Missouri, and found his wife, Betsy, stabbed to death. Immediately, Russ was the prime suspect in her death,

although he had an alibi. He had been playing games at a friend's house and then stopped by a fast-food restaurant on his way home. Although he had a strong alibi and witnesses who

backed up his story, Russ was arrested for his wife's murder. Testimony from his wife's best friend, Pam Hupp, played a pivotal role in the trial. He was convicted of murder in

2013. After a successful appeal and second trial in 2015, Russ was exonerated after his defense attorney was permitted to introduce evidence that was withheld from the original trial jury,

THE LATEST CRIME COVERAGE? SIGN UP FOR_ PEOPLE'_S FREE TRUE CRIME NEWSLETTER__ FOR BREAKING CRIME NEWS, ONGOING TRIAL COVERAGE AND DETAILS OF INTRIGUING UNSOLVED CASES._ After Russ was

set free, detectives were still left with one question: Who killed Betsy Faria? Some began to wonder if Hupp had anything to do with the gruesome murder, but could she really stab her friend

more than 50 times? If so, why? What investigators found led them down a dark trail that featured at least two murders, and one that's still in question. In the new episode of _People

Magazine Investigates_, friends and family talk about Betsy's shocking murder and express sadness and disbelief about their loss and the case that gained nationwide attention. _See more

on the murder of Betsy Faria on _People Magazine Investigates_, "The Truth About Pam," airing tonight at 9 p.m. ET on Investigation Discovery and also streaming on discovery+._