The New York Times has the story:
According to two publishing executives who participated in meetings, Mr. Martin’s parents, Sybrina Fulton and Tracy Martin, said they intended to write a book that gives the full picture of their son while tracing their own experience of shock and sorrow. The meetings were described as somber and moving by publishers who were present. Ms. Fulton and Mr. Martin were accompanied by Jan Miller, their Dallas-based literary agent.
Since their unarmed son was shot and killed, both Fulton and Martin have been actively fighting against Stand Your Ground laws. The two recently created a Change.org petition, urging for these laws to be reviewed.