MOBILE, Ala. (AP) _ Charlie Fox, who wrote the duet ``Mockingbird'' that became a hit twice, once for himself in the 1960s and then again for James Taylor and Carly Simon in the 1970s, has died of leukemia at age 64.

Fox, who died Friday, toured the world as a duo with his sister, Inez F. Fletcher, in the 1960s. They made it into the top 10 with ``Mockingbird'' in 1963. Taylor and Simon took the song to No. 1 in 1974.

The Fox duo followed up ``Mockingbird'' with several more hits, including ``Hurt By Love,'' ``I Stand Accused,'' ``No Stranger to Love'' and ``(1-2-3-4-5-6-7) Count the Days.''

At one point, their backup band was a group of Alabama youths who went on to find fame of their own as the Commodores.

The funeral will be on Saturday.

Fox is survived by his wife, Hattie P. Fox, and a sister.