James Macnab

They're just north of Disney World, but to the men and women of the Marion County Sheriff's Department, the 1,600 square-mile area they patrol is no fantasy. Marion County's highways, forests and suburban neighborhoods are crime scenes to more than 7,000 felonies a year. But with a jurisdiction larger than the state of Rhode Island, ground units find it impossible to have eyes everywhere.

When dozens of women enjoying their golden years unexpectedly died at Senior Living Communities across the Dallas area, authorities classified the deaths as natural causes. No one suspected that a cold-blooded, serial killer, posing as a maintenance man, was targeting one of the most vulnerable populations: elderly women.