  Fix an algebraically closed field $\mathbb{F}$ and an integer $n \geq 1$. Let
$\text{Mat}_n(\mathbb{F})$ denote the $\mathbb{F}$-algebra consisting of the $n
\times n$ matrices that have all entries in $\mathbb{F}$. We consider a pair of
diagonalizable matrices in $\text{Mat}_{n}(\mathbb{F})$, each acting in an
irreducible tridiagonal fashion on an eigenbasis for the other one. Such a pair
is called a Leonard pair in $\text{Mat}_{n}(\mathbb{F})$. In the present paper,
we find all Leonard pairs $A,A^*$ in $\text{Mat}_{n}(\mathbb{F})$ such that
each of $A$ and $A^*$ is irreducible tridiagonal with all diagonal entries $0$.
This solves a problem given by Paul Terwilliger.
