There was a William M. Tucker in Co. H, 9th Kentucky Cavalry, CSA. But I don't know if this is the same soldier - this soldier had a KY Confederate pension (#3770 from Campbell Co.), and his widow Nancy Hutson Tucker also had a pension after his death (#4410, Campbell Co.). His pension file says he was born in 1841 in Bracken Co., and hers says he was born in 1846 in Bracken Co. (died 3/25/1926).
This is the only William Tucker listed in rosters of the 9th Ky. Cav. CSA. (Info from Steve Lynn's books on KY Confederate Soldiers and Pensioners)
Hope this helps,