A 26-year-old father who moved recently from Hawaii to Nevada sobbed today during his first appearance in a Las Vegas courtroom on a murder charge alleging he fatally injured his young son.  Jonathan Quisano did not enter a plea. His preliminary hearing was set for July 22. He'll remain held at Clark County Jail. Quisano was arrested Friday after his three-year-old son, Khayden, was pronounced dead of head and internal injuries that doctors say were too severe to have been caused by a fall.  Quisano told police the boy fell while playing on a sofa.