Just a few days after Johnny Wactor was fatally shot and killed, the cause of his death has been revealed. According to the coroner’s report, obtained by RadarOnline.com, the General Hospital star died by homicide at 37 years old. The manner of death was confirmed as a gunshot wound to the chest. As OK! previously reported, Wactor’s family said he was with a female co-worker, whom he protected, just before he was shot. “We’re Southern, born and raised, and we would never let a female walk to their car by herself,” Johnny’s younger brother Grant Wactor explained, noting: “He came across them an…