The 911 call in the Hollywood hairdresser murder. And investigators explore links between six violent deaths and a group called the Zizians.

In a Los Angeles courtroom, prosecutors play police interviews with a woman accused of conspiring to kill her celebrity hairstylist husband. NBC News investigative reporter Rich Schapiro shares his reporting on a Bay Area-based group that investigators believe may be tied to deaths starting back in 2022. And JonBenét Ramsey's father talks to the new Boulder police chief. Find out more about the cases covered each week here: www.datelinetruecrimeweekly.com

Read Rich Schapiro's NBC News article How did a German math genius get drawn into a 'cult' accused in coast-to-coast killings?