Five months after a hung jury, Chemirmir is again brought to trial. This time a conviction brings a much-needed feeling of justice. But family members brought together by this tragedy won't stop until they've made a difference by helping protect all seniors. In Part 4, the last in our series, AARP's Tina Tran shares how ageism and missed opportunities on the part of institutions and law enforcement allowed Chemirmir to go undetected, and she offers tips on how we can best protect our loved ones.