. >> reporter: next door to kay lived becky sears. becky had her hands full, too. she and her husband tony had five kids, including two older sons from becky's first marriage. >> she's one of those people who's very outgoing, one of those, "hey, how you doing," type people. >> reporter: tamara got to know both, but says kay and becky really hit it off. >> they were best friends. they were basically inseparable. and they were together 24/7 almost. >> reporter: the two neighbors became peas in a pod. they worked at the same physical therapy center called healing hands. >> they'd go on vacations with each other. >> reporter: jurgen cowling was their boss. >> when you think of them being around your office, what do you see them doing? kay, the little league mom, got up to take derek to school, and becky, the mother of five, left her house a few minutes later to drop off her kids before her work day began. all very routine. until 8:30 a.m., when contractor mitch cozart showed up to do some maintenance work on kay's back door. you're coming around the corner. you lift up