When Dr. Teresa Sievers doesn't show up to work, her coworkers and family become very concerned about her wellbeing.

Learn more about Mary Yoder, a seemingly healthy chiropractor from Buffalo, New York, who died in 2015 at the age of 60, later determined to have been poisoned.

Dr. Teresa Sievers is found brutally murdered, but was she killed after a robbery gone wrong?

Get a preview of the Season 2 finale of Prosecuting Evil with Kelly Siegler, which will delve into the case of Ali Irsan.

When police bring Ali Irsan in for questioning, he begins mimicking symptoms of a heart attack.

When Mark Sievers hands his phone over to police, they find a huge number of explicit videos and pictures of women other than his wife.

Mark Sievers attempts to blame his mother, Bonnie, for failing to set his home's security alarm.

Jeanine Cammarata's best friend, Jessica Pobega, speaks about Jeanine's disappearance.

The man in the widely circulated video clip became known as “Bridge Guy” and investigators later concluded it was Richard ...

Pamela Johns' son, Mike Tillotson, speaks out about Brett Bednarz's role in the murder of his mother.

As investigators dig deeper into the case of Tim Wiltsey, strange details come to light.

Learn more about the latest developments in the legal proceedings involving Idaho murders suspect Bryan Kohberger.