Police are investigating a shooting in Waikiki.  They have now classified the case as a murder - attempted suicide.   Paramedics were called to 2421 Ala Wai Boulevard just before 4:30 a.m. where they found a 33-year-old woman dead at the scene, and a 40-year-old man seriously wounded.  Both patients suffered apparent gun shot wounds.  The man was taken to a trauma center in serious condition. He remains hospitalized.