Well, Mama did say to knock you out. LL Cool J put his "NCIS: Los Angeles" training to good use against a burglar in his L.A. home early Wednesday morning. The 42-year-old rapper turned TV military cop left the would be robber with a broken nose and jaw in what police sources described to the LA Times as a"knock-down, drag-out" fight and detained him for police. Law enforcement sources told the gossip site TMZ that LL, aka James Todd Smith, was woken by a noise at about 2 a.m. and confronted the intruder downstairs.