  If $(W,S)$ is a right-angled Coxeter system and $W$ has no $\mathbb Z^3$
subgroups, then it is shown that the absence of an elementary separation
property in the presentation diagram for $(W,S)$ implies all CAT(0) spaces
acted on geometrically by $W$ have locally connected CAT(0) boundary. It was
previously known that if the presentation diagram of a general right-angled
Coxeter system satisfied the separation property then all CAT(0) spaces acted
on geometrically by $W$ have non-locally connected boundary. In particular,
this gives a complete classification of the right-angled Coxeter groups with no
3-flats and with locally connected boundary.
