On Cannon-Thurston maps for relatively hyperbolic groups
  Baker and Riley proved that a free group of rank 3 can be contained in a hyperbolic group as a subgroup for which the Cannon-Thurston map is not well-defined. By using their result, we show that the phenomenon occurs for not only a free group of rank 3 but also every non-elementary hyperbolic group. In fact it is shown that a similar phenomenon occurs for every non-elementary relatively hyperbolic group. 
Yoshifumi Matsuda and Shin-ichi Oguni
math.GR math.GT