of 2015. >> i'm shepard smith. this hour we'll look back at the year's top stories in world news, politics, entertainment and more. we begin with the top u.s. headlines of 2015. a year that saw the deadliest acts of terror on american soil since the attacks of 9/11. >> si yesterday farook and tashfeen malik were husband and wife murder team. they walked into a work party fill willed farook's colleagues and opened fire. first responders arrived to a scene of choose. >> some people were laying there, some people were crying, some people were screaming. >> the killers escaped. but not for long. >> they're after somebody. oh [bleep] >> police tracked their suv and kill the couple in the streets.