California Highway Patrol Officer Kopriva keeps protesters marching against police violence from storming Interstate 980 on Tuesday, Dec. 9, 2014, in Oakland, Calif. Several hundred demonstrators rallied for the fourth consecutive day with some occupying a freeway and looting a supermarket. (AP Photo/Noah Berger)

Photos: California Police Protests

Hundreds of protesters angered at the killing of unarmed black men by white police officers march through California streets. View entire ph…

David Letterman

CBS sets Letterman’s last show for May 20

NEW YORK (AP) — David Letterman will host his final “Late Show” next May 20. CBS and Letterman’s production company announced the exit date …