(Estacada, OR)  --  Authorities say a man who's accused of stabbing a person in an Estacada grocery store is believed to be connected to a woman's death in Colton.  Clackamas County sheriff's deputies say a man was seen entering the Harvest Market Thriftway around 2:15 yesterday afternoon, covered in blood and holding a knife and what looked like a human head.  Investigators say the suspect stabbed and critically wounded a store employee, but other employees were able to tackle the suspect and detain him until authorities arrived.  Deputies say a woman was found dead minutes later at a home in the 25-thousand block of Elwood Drive in Colton, and it's believed both incidents are connected.