  Let $\mathbb{K}$ be a number field with ring of integers $\mathfrak{O}$ and
let $\mathcal{G}$ be a Chevalley group scheme not of type $\mathtt{E}_8$,
$\mathtt{F}_4$ or $\mathtt{G}_2$. We use the theory of Tits buildings and a
result of T\'oth on Steinberg modules to prove that
$H^{\operatorname{vcd}}(\mathcal{G}(\mathfrak{O}); \mathbb{Q}) = 0$ if
$\mathfrak{O}$ is Euclidean.
