Roof Leak or Chimney leak Knoxville, TN
It is important to look at several things when determining what is making a chimney leak. The bricks or siding can certainly be a cause. A bad or worn out chimney cap can cause roof leaks. And the flashing that is where the chimney meets the shingles will be a common reason that chimneys leak.
In this page Litespeed Construction describes what caused this chimney to leak.