The family of slain Philadelphia police officer Moses Walker tells Tom MacDonald they believe his death could have been prevented. Dave Davies learns of the Chester-Upland School District’s recovery plan. Peter Crimmins reports on the new Music Director for the Philly Pops. We meet NewsWorks’ newest blogger, science writer Faye Flam. Maiken Scott looks at how researchers are using online avatars to aid in real weight loss. Dave Heller talks with Kathleen Chaney about finding old love letters washed ashore by Sandy.