Police have made no arrests in an early morning stabbing yesterday in Waipahu. They were called to Pupupuhi and Pupumomi Streets just before 12:30 a.m. to a fight involving a group of men. Paramedics took a man to a trauma center in critical condition and he died at the hospital. The Honolulu Medical Examiner's Office identified the victim as 28-year-old M-C Eis of Waipahu. The M-E said Eis died of blunt impact to the head and a puncture wound to the torso. Police have opened a murder investigation.