The former child star had been dealing with an undisclosed medical issue before her death. Police responded to a 911 call shortly after 8 a.m. at a 51-story luxury apartment tower in Manhattan’s Hell’s Kitchen neighborhood where officers found Trachtenberg "unconscious and unresponsive,” according to an NYPD statement. Paramedics pronounced her dead at the scene. No foul play was suspected and the New York Medical Examiner is investigating the cause of death, police said.