While police continued to investigate the unexpected death of longtime Mercury News journalist Rich Ramirez, there were indications Thursday that the 44-year-old newsman may have taken his own life. Ramirez, a veteran reporter and editor who served for the last 12 years as assistant to the executive editor, was discovered Wednesday morning in his Livermore back yard, with a fatal injury the Alameda County Coroner's Office described as a knife wound in his midsection. A coroner's spokesman said the death was considered a "possible suicide," adding that self-inflicted knife wounds are uncommon but not unheard-of as a cause of death....