Father of slain reporter Alison Parker writes about mission to end gun violence

WASHINGTON - Nearly four years after Virginia reporter Alison Parker and photographer Adam Ward were shot and killed on the job.

In his new book For Alison, Andy Parker, and Alison's father, honors her memory by writing about his mission to end gun violence.

ONLINE: For Alison: The Murder of a Young Journalist and a Father's Fight for Gun Safety