Lawrence O'Donnell, host of "The Last Word" on MSNBC, has been off the air. He joked with Rachel Maddow ahead of his absence. Here's what to know.

MSNBC's Lawrence O'Donnell is exploring new opportunities, after the anchor started to reportedly "other options." ...

And Lawrence O'Donnell "hit an all-time low among the advertiser-coveted demographic of adults age 25-54," where his show ...