Dr. Jerry Umanos  was doing exactly what he wanted to do with his life when he was killed in Afghanistan.  His brother-in-law says the pediatrician who was one of three people shot to death at a Kabul hospital earlier this week, became a doctor so he could help poor children.  Speaking by phone from suburban Atlanta, Jeff Schuitema says Umanos and his wife first went to Afghanistan years ago, once their children were grown.  They’d been returning ever since, coming back to Chicago to earn enough money so he could continue his volunteer work.  He says his sister, Jan Schuitema, went with Umanos and taught at a girls’ school, but returned more often than he did to earn enough money so that he could stay in Afghanistan.