A longtime San Francisco newsman has spoken out about his weekslong absence from the air — revealing a tragic family emergency kept him from the anchor chair. KRON4 Morning News anchor James Fletcher broke his silence Thursday to announce that his son, Collin, had been paralyzed from the waist down after being hospitalized with a “sudden, unexplained neurological crisis” earlier this month. Fletcher said the family doesn’t know how the 23-year-old became paralyzed, and doctors are still “