Let's get more on miriam carey. Abc's pierre thomas examined where she came from and what may have triggered her snap. Reporter: Today, police are dissecting the woman's life, looking for a clue.... See More
Let's get more on miriam carey. Abc's pierre thomas examined where she came from and what may have triggered her snap. Reporter: Today, police are dissecting the woman's life, looking for a clue. Something that would tell them why, what led her to come to washington. Overnight, miriam carey's mother told abc news, her daughter had no history of violence. And confirms she has struggled since the birth of her 1-year-old daughter in august of last year. She had postpartum depression after having the baby, her mother said. Family and friends are shocked. She has a wonderful life. It doesn't make any sense at all. Reporter: Thursday night, police in hazmat suits surrounded an apartment building in stamford, connecticut. They were searching for computers, notes, anything that could point to motive. Carey who worked as a dental hygienist is described by her boss as always happy and a nonpolitical person. Dr. Steven oken tells abc news, it's the further thing I would suspect her to do, especially with her child in the car. Friends describe carey as very professional and foe cutsed. She moved to stamford, connecticut, because new york rents were so high. And they said carey never expressed sentiments about the government. Her friend just saw her on tuesday. Everything was okay. A little joke. And she went about her business. It's just -- Reporter: Carey's mother told us she didn't know why she was in washington. Like us, the family has so many questions. Robin? And we are all still searching for answers. Thank you, pierre. Now, to reports that miriam
This transcript has been automatically generated and may not be 100% accurate.