Chilling new details have emerged after a Michigan couple was arrested last week in the alleged beating death of the woman’s 6-year-old son. Authorities called it one of the worst cases of child abuse they had ever encountered. Prosecutors said the boy was stapled to the wall and shot with a BB gun before dying due to “horrific” abuse, reported WDIV Channel 4 in Detroit. Daniel Giacchina, 32, and Elaina Jennings, 25, are now facing murder and several other charges in connection with the death of Giovanny “Chulo” Jennings. The couple could face life in prison if convicted. The couple was arrest…