Former NFL defensive lineman Kevin Johnson, 55, was found dead on Wednesday morning at a homeless encampment in Los Angeles' Willowbrook area. Sheriff's deputies responded to a report of an unconscious man and pronounced Johnson dead at the scene. Johnson, who played for the Philadelphia Eagles and Oakland Raiders from 1995 to 1997, is believed to have been living at the encampment. His cause of death was blunt head trauma and stab wounds, with the manner ruled a homicide. Friends indicated Johnson struggled with health issues, possibly CTE, which may have contributed to his homelessness. Investigators are seeking information from any witnesses.