Has K. K. Downing ever been a member of Black Sabbath?
Yes
No
Only for one year
Occasionally for live shows
Answer
No, K. K. Downing has never been a member of Black Sabbath. He was a member of Judas Priest from 1970 to 2011, and has been a member of the band KK's Priest since 2011.
The Epic Guitar Saga: Unleashing the Legends of K.K. Downing