On anniversary of MLK's death, his words are 'more relevant' than ever, his son says

In "times of challenge," Martin Luther King Jr. didn't back down, his family says. It's a lesson that still resonates as they remember the slain civil rights leader's legacy Saturday in a video message.

King, who was assassinated 52 years ago while standing on the balcony of a Memphis, Tennessee, motel, was an outspoken opponent of poverty, racism and militarism, and believed that fighting against those "evils" would provide a "beloved community" for all.