Marlene Vidal's longtime friend took KSAT step by step through what she said was Vidal's declining mental health leading up to Friday when Vidal is accused of killing her two children.

The case of an Edinburg mother accused of setting a vehicle on fire with her two children inside continues to develop hundreds of miles away in San Antonio. Here's what we know.

As the San Antonio Police Department and the Child Protective Services investigate the mother charged with capital murder for the deaths of her two children found in a burning car Friday, the public and welfare experts are wondering what led up to the tragedy.