A Wisconsin trial-consulting firm will be featured in a documentary that premieres this weekend.

Hartland-based Rosenberg Consulting Services President Rob Rosenberg will be featured in a two-hour documentary titled “Slender Man Stabbing: The Untold Story.” It premieres Saturday at 7 p.m. on the REELZ channel and was produced by Dorsey Pictures.

REELZ is a cable and satellite network that focuses on programs related to celebrities and national news.

The documentary explores the case of two 12-year-old Wisconsin girls, Morgan Geyser and Anissa Weier, who in May 2014 lured a friend, Payton Luetner, into a Waukesha park and stabbed her 19 times in order to appease a fictional character called Slender Man.

RCS, which specializes in courtroom technology and trial graphics, was part of Geyser’s defense team. Geyser pleaded guilty to attempted first-degree homicide and was sentenced last year to 40 years in a mental hospital. She recently filed an appeal. Weier was sentenced to a mental hospital for 25 years.

Filmmakers interviewed Rosenberg about his firm’s work on the case. RCS, Rosenberg and his team used a technique called Wizpor, which was created by Trial Consultant Amy Singer and involves doing mock trials and tailoring attorneys’ arguments using advice from online focus groups.

Originally published at Wisconsin Law Journal on Friday, January 25, 2019