Anna Kepner's stepbrother walked out of the courthouse a free man — and the FBI's own case agent couldn't confirm whether the most important evidence was ever collected. Aaron Spencer's murder charge was thrown out because investigators lost the one piece of evidence that mattered, and a judge called it a coverup. And Mackenzie Shirilla never said a word to police, but her car recorded everything she wouldn't admit. In Anna Kepner's case, DNA points to Timothy Hudson with near-certainty — but all of it connects to what happened before Anna died, not to the act that ended her life. The agent running the investigation said under oath he wasn't sure if anyone tested the evidence from Anna's neck. And the judge still let Hudson walk. Aaron Spencer killed the man accused of hurting his daughter after the system let that man back near her on bond. Then investigators lost the dashcam SD card and violated their own evidence procedures. A judge found the conduct "so egregious" the murder charge had to be dismissed. Mackenzie Shirilla's data recorder captured the accelerator at full capacity and zero braking, aimed at a brick building at close to a hundred miles per hour. She'd rehearsed the route. She'd made threats. And coded jail calls allegedly revealed her planning a fake medical defense. Retired FBI Special Agent Jennifer Coffindaffer and retired FBI Counterintelligence Behavioral Analysis Program Chief Robin Dreeke join Tony Brueski to examine what went wrong, who failed, and what it takes for the system to actually work. Join Our SubStack For AD-FREE ADVANCE EPISODES & EXTRAS!: https://hiddenkillers.substack.com/ Want to comment and watch this podcast as a video? Check out our YouTube Channel. https://www.youtube.com/channel/UC8-vxmbhTxxG10sO1izODJg?sub_confirmation=1 Instagram https://www.instagram.com/hiddenkillerspod/ Facebook https://www.facebook.com/hiddenkillerspod/ Tik-Tok https://www.tiktok.com/@hiddenkillerspod X Twitter https://x.com/TrueCrimePod This publication contains commentary and opinion based on publicly available information. All individuals are presumed innocent until proven guilty in a court of law. Nothing published here should be taken as a statement of fact, health or legal advice. #HiddenKillers #JenniferCoffindaffer #RobinDreeke #AaronSpencer #MackenzieShirilla #AnnaKepner #TrueCrime #FBIAnalysis #EvidenceFailures #SystemFailed