Pi Day occurs on March 14, because the date is written as 3.14 in the United States. Pi is the ratio of the circumference of a circle to its diameter, or approximately 3.14 (its exact value is ...

Ashley Van Hemert tells "20/20" about the fateful 2018 night her roommate's estranged husband barged into their home, killed his wife and left her for dead.

Ruling Anne Marie Hochhalter's death as a homicide raises the death toll of the Columbine High School shooting to 14.