(Canby, OR)  --  An ax is allegedly among the weapons used by a man accused of killing four people including his nine-month-old daughter before being shot and killed by police.  The Oregon State Medical Examiner says 42-year-old Mark Gago's victims each died from sharp-force trauma caused by an ax or knife.  Police say Gago killed his daughter and three adults at a home near Canby overnight Saturday and was about to kill a little girl when responding officers opened fire, killing him.  Police are identifying the deceased victims as Gago's daughter Olivia Lynn Rose Gago, his girlfriend Shaina Sweitzer, his stepfather Jerry Bremer and his mother Pamela Bremer.