Court records show Carter was likely a key witness in the murder trial of his half-brother, Kylr Yust.
41 Action News Reporter Andres Gutierrez spoke with Carter last year about the case against his brother and his concern for the Kopetsky and Runions families.
"We want them to feel better at night that he's finally put away. I'm not okay and my family is not okay with anything that he did,"
Carter said in October 2017 .
But with Carter's death, he said a judge may allow a recording of Carter or a detective who interviewed him to testify to what he said.
"Depending on the information that he would have given to the prosecutors and testified to in court, it could be devastating to their case," Service said.