A New Jersey sheriff's sergeant who led his agency's K-9 unit now faces criminal charges after his two police dogs died of heat stroke inside a locked patrol vehicle he allegedly left them in for about seven hours. Cody Henderson, a K-9 sergeant with the Salem County Sheriff's Office, was charged this week with multiple counts of animal cruelty over the deaths of Rip, a four-year-old Belgian Malinois, and Boomer, a six-year-old springer spaniel.…