Teenager Marta del Castillo's disappearance made headlines in Spain. Family, friends, police and more weigh in on a case that is still unresolved.Teenager Marta del Castillo's disappearance made headlines in Spain. Family, friends, police and more weigh in on a case that is still unresolved.Teenager Marta del Castillo's disappearance made headlines in Spain. Family, friends, police and more weigh in on a case that is still unresolved.