Grave Mysteries

Investigators follow a woman's digital trail to uncover her killer.

A phone app could be key in finding a transgender woman's killer.

A teenager disappears after she begins dating an older man.

A man task detectives with unraveling his bride's mysterious disappearance.

A professor had a secret online life that may have led to her killing.

A man launches into a bitter social media war with his ex and her new man.