Viewers tune out networks’ nightly news last week

NEW YORK — The big news in TV ratings last week was how so few people watched the news, according to Nielsen Media Research.

Logging only 4.9 million viewers, the “CBS Evening News” dipped below 5 million for the first time on record. ABC’s “World News” had 6.4 million viewers — a drop of a half-million viewers from the week before. ABC’s Charles Gibson and CBS’ Katie Couric both had the week off.

Brian Williams at “NBC Nightly News” won the week with an average of 7.8 million viewers, down a half-million from the prior week.

Meanwhile, a slew of popular repeats of shows such as “NCIS” and “The Mentalist” helped CBS to a win in prime time.