Cathryn Mellender played a key role in the Chandler Halderson case, which is the focus of ABC's 20/20 episode Road Map To Murder, airing May 30, 2025.

When Chandler Halderson's lies about attending college and being offered a SpaceX job were about to be exposed, prosecutors ...

A location-tracking feature on Snapchat was instrumental in solving a double murder case in Wisconsin involving Chandler ...

Cathryn Mellender, cleared by police, showed detectives a screenshot of a map that placed her boyfriend, Chandler Halderson, ...

MADISON (WKOW) — Chandler Halderson's former girlfriend, Cathryn Mellender, took the stand Thursday afternoon. Halderson is charged in the death's of his parents, Bart and Krista Halderson after he ...

This story previously aired on Aug. 5, 2023. Bart and Krista Halderson had everything a couple could want: a beautiful home in Windsor, Wisconsin, and two sons they adored. Mitchell, 24, who ...

Chandler's girlfriend, Cathryn "Cat" Mellender, allowed investigators to download data from her phone. Sims heard that Chandler had cheated on Mellender in the past, so she would keep tabs on him ...

When Bart and Krista Halderson suddenly disappeared in July 2021, their son, Chandler, alerted police. A search of a popular social media app helped lead investigators to a gruesome discovery.

Bart and Krista Halderson had everything a couple could want: a beautiful home in Windsor, Wisconsin, and two sons they adored. Mitchell, 24, who worked in tech, Chandler, 23, a college student ...