In the early hours of August 13, 2018, in Frederick, Colorado, American oil field operator Christopher Lee Watts (born May 16, 1985) murdered his pregnant wife Shanann (34) by strangulation, and their two children Bella (4) and Celeste (3) by suffocation. He buried Shanann in a shallow grave near an oil-storage facility, and dumped his children's bodies into crude oil tanks. Watts initially maintained his innocence in his family's disappearance, but was arrested on August 15, after confessing in an interview with detectives to murdering Shanann. He later admitted to murdering his children.
https://en.wikipedia.org/wiki/Watts_family_murders