Booking photo of Michael BoysenBy Teresa Carson PORTLAND, Oregon (Reuters) – Police stormed a inn room in Oregon on Tuesday to end an eight-hour standoff and arrest an ex-convict accused of killing his grandparents after that they had thrown him a birthday party to have fun his release from prison, authorities mentioned. The suspect, Michael "Chadd" Boysen, 26, used to be taken into custody through police within the coastal city of Lincoln Metropolis, seventy six miles southwest of Portland, at about 7 p.m. native time affected by self-inflicted knife wounds, Police Chief Keith Kilian mentioned. …