CBS sent out word to TV Critics Association members tonight that its entertainment president Nina Tassler has had to cancel Monday’s scheduled appearance at TCA Summer TV Press Tour 2013, owing to the death of a close friend. CBS CEO Les Moonves is taking her place tomorrow morning at the tour, ostensibly to talk about CBS’s programming plans for the coming TV season. But Moonves has been duking it out for days with Time Warner Cable execs over how much TWC should cough up per subscriber to carry CBS stations that are owned by the network in cable homes in New York, Los Angeles, Dallas and elsewhere around the country – about 3.5 million TWC homes. Late last week, the two sides had set a new deadline of 2 p.m. Monday. CBS is the country’s most popular television network.