Elizabeth Keys, a 33-year-old lawyer, was among the passengers aboard a plane that collided with a military helicopter and plunged into a river in the US.

The state executed Bowman for the 2001 murder of 21-year-old Kandee Martin, a young mother who was killed five days before her son's second birthday.

When is the next leap year? Here are some fascinating leap year facts, along with all the details about why leap day always falls on Feb. 29.