Air time and how to watch Season 6 of 'Cold Justice' premieres at 8.00 pm ET/PT on Saturday, July 10. Oxygen is now available to download on the Roku streaming service. Alongside Roku, Oxygen recently launched its streaming app on Amazon Fire TV devices. The Oxygen app is also available on Apple TV as well. Plot In Season 6, viewers of 'Cold Justice' can expect to see the team aid law enforcement to make two more arrests as veteran prosecutor Kelly Siegler along with a team of seasoned detectives travels to small towns to crack unsolved homicide cases. Cast Kelly Siegler According to a synopsis on the Oxygen website, "Kelly Siegler is a veteran prosecutor, known nationwide for her toughness, tenacity, and skill in the courtroom. For over 21 years, Kelly fought for justice for Harris County, Texas residents, and crime victims until she resigned from the District Attorney's office in May 2008. She has prosecuted some of the hardest cases with some of the toughest criminals Harris County has seen and has done so against the most formidable and respected criminal defense attorneys in the state. She has tried approximately 200 jury trials and is not only respected for her ability in the courtroom but also sought out as a speaker and expert in effective courtroom advocacy. Kelly has tried over 65 murder cases and secured convictions in all of them. A fierce advocate on behalf of crime victims and their families, she also has the respect of members of law enforcement agencies, not just in Harris County but also nationwide."