“Moon River” singer Andy Williams died Tuesday at the age of 84. The cause was bladder cancer. Williams was one of the most popular singers of the 1960s after recording “Moon River” in 1961, written by Johnny Mercer and Henry Mancini. In the 1970s and ’80s, he sang on Christmas specials and hosted the Grammys, the Golden Globes, and the People’s Choice Awards. In the late 1970s he made headlines when he stood by his ex-wife, French-born singer and dancer Claudine Longet, who was charged with fatally shooting her boyfriend in Aspen, Colo.