A standoff in Portland resulted in the death of a homeless man. Portland Police say the man approached officers with a large knife yesterday afternoon.  There was a standoff as the man was allegedly threatening to kill a female security guard at a nearby business. The standoff ended with police shooting the 60 year old man.  The man had been living in the area in an abandoned carwash lot.  The security guard says yesterday's stand-off was the second time in two days that he had threatened to kill her.