Getty General Manager Nico Harrison of the Dallas Mavericks looks on against the Los Angeles Lakers. The Nico Harrison era has come to an end in Dallas. ESPN’s Shams Charania reported Tuesday morning that the Dallas Mavericks are parting ways with their general manager of four years. Shams Charania @ShamsCharania · Follow BREAKING: The Dallas Mavericks and owner Patrick Dumont are expected to fire general manager Nico Harrison at a 10 am central time meeting on Tuesday, sources tell me and Tim