Norvo Tigan

From Memory Alpha, the free Star Trek reference.

Norvo Tigan was the younger brother of Ezri Dax and Janel Tigan, and the son of Yanas Tigan. He and Ezri had a close relationship; he even used her childhood nickname, 'Zee', when addressing her. He was not nearly as close to the rest of his family.

A brilliant but discouraged young artist with a quiet, sensitive manner, Norvo was an easy target for his controlling mother. Norvo was resentful of Yanas's constant criticism and refusal to acknowledge his worth. One day he finally snapped, and murdered Morica Bilby, a friend of Miles O'Brien and a woman who was pressuring the family for more money. When Ezri discovered this, she blamed her mother and herself—her mother for her controlling ways and herself for not seeing her brother's problems earlier. Norvo was sentenced to thirty years in prison for his crime. (DS9: "Prodigal Daughter")

Norvo was played by Kevin Rahm.