 O'Brien, however, rejected the timeslot.In January 2010, O'Brien reached a deal with the network that would see him leave "The Tonight Show" on January 22, 2010, and two months later Leno returned as host of "The Tonight Show" on March 1, 2010.In April 2010, O'Brien signed a deal with the cable network TBS to host a new late-night talk show.