How a Texas serial killer went under police radar for years

The recent conviction of a prolific killer sheds light on the need for protections for a vulnerable population

As Hollyn Williams and Lindsey Roan cleaned out their mother's apartment, things just didn't add up.

Williams had found their mother, Martha Williams, dead on the floor of her luxury senior living apartment in Plano, Texas, just north of Dallas in March 2018. Police and medical examiners decided she had died of natural causes.