A mother's unwavering crusade for justice for her daughter's murder leads to the hidden clue that helped catch a killer in a new episode of "20/20" airing on Friday, January 30.

Blodgett's ex-boyfriend Daniel Bartelt was eventually convicted in her death.

Melissa Etzler was walking her dog at a local park when a stranger attacked. Her case helped authorities solve the case of Jessie Blodgett, who was murdered a few towns away.

Trailer: 20/20 Special ‘Avatar: A New Era’ - premieres Dec. 12th at 10/9c on ABC Go inside the world of 'Avatar' with James Cameron, Zoe Saldaña, Kate Winslet, Sigourney Weaver, Sam Worthington and ...

A young mother brutally murdered. What secrets do her ex-boyfriend & his new fiancée hold? The new “20/20” premieres on a special night: Wednesday, Dec. 17 at 10/9c on ABC. Stream on Disney+ and Hulu.

Man convicted in killing of young Texas mom speaks out in '20/20' prison call In an exclusive new interview with "20/20," Andrew Beard apologized for his "despicable and downright evil actions." ...

Trailer: 20/20 'Badass Detective' - Premieres Jan. 9th on ABC. Walk alongside one fearless detective who will stop at nothing to solve two high stakes murder mysteries. 20/20's 'Badass Detective’ ...

In the quiet outskirts of Bismarck, North Dakota, a seemingly ordinary family life unraveled into tragedy in early 2020. Chad Entzel, a 42-year-old enthusiast of bowling, golf, and stock car racing, ...

Trailer: 20/20 ‘Ride or Die’ - premieres Dec. 17th at 10/9c on ABC A young mother brutally murdered. What secrets do her ex-boyfriend & his new fiancée hold? The new “20/20” premieres on a special ...