Con Ed is facing its third lawsuit stemming from the steam pipe explosion that shook Midtown earlier this month. The mother of the injured man whose tow truck fell into the crater created by the blast now joins the woman who claims her post-traumatic stress disorder was exacerbated by the incident and the dentist to the stars who says he’s lost $25 million during the time his office building’s been closed. While Gregory McCullough, 21, struggles to stay alive in the burn unit at New York Presbyterian Hospital, two lawyers from the Cochran Firm are searching for answers. McCullough’s parents, Frank and Tanya Stewart, will announce the lawsuit today. In the meantime, click here to read one witness’ account of the gory details that left McCullough with third-degree burns over more than 80 percent of his body.