--A security guard and two other individuals chased down a robber who had stolen from a 66-year-old woman yesterday as she exited a Dorchester convenience store. BPD officers responding to the crime were directed to the suspect by the pack of Good Samaritans. [BPD News] --A man was killed last night outside a White Hen Pantry in Lynn; he was shot twice in the chest. Very few details are yet available. [Boston Globe] --Police......