  In this paper, we give a class of reflection rigid Coxeter systems. Let
$(W,S)$ be a Coxeter system. Suppose that (1) for each $s,t\in S$ such that
$m(s,t)$ is odd, $\{s,t\}$ is a maximal spherical subset of $S$, (2) there does
not exist a three-points subset $\{s,t,u\}\subset S$ such that $m(s,t)$ and
$m(t,u)$ are odd, and (3) for each $s,t\in S$ such that $m(s,t)$ is odd, the
number of maximal spherical subsets of $S$ intersecting with $\{s,t\}$ is at
most two, where $m(s,t)$ is the order of $st$ in the Coxeter group $W$. Then we
show that the Coxeter system $(W,S)$ is reflection rigid. This is an extension
of a result of N.Brady, J.P.McCammond, B.M\"uhlherr and W.D.Neumann.
