Larry King tweeted his planned retirement from CNN on Tuesday. In an interview with the LA Times, he said the requirement that he cover celebrity news and crime stories made it a ?tough? daily grind. ?You?ve got to do tabloid shows,? he said. ?You?ve got to do the girl that?s missing in Aruba. It?s hard to make the case that that is major news, but that?s what?s news today.? King, who started in radio in 1957 has interviewed more than 40,000 people on air. He will still work on specials for CNN, which he joined in 1985 when the network was only 5 years old.