Miriam Carey, the woman killed by police after a chase in Washington, DC, had believed the president was communicating with her and was delusional, a federal law enforcement official told the Associated Press.
Copyright 2013 Scripps Media, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.
(CNN) -- A young mother is dead and her year-old child is in protective custody.
A day after Miriam Carey ran a barricade and led police on a high-velocity chase through the middle of the nation's capital, authorities were searching for clues to explain the bizarre chain of events that led to her death. She was shot dead and her baby survived unhurt. But many questions surrounding those facts remain.
Here's what we know about Carey, a 34-year-old who reportedly had worked as a dental hygienist in Connecticut.
Boyfriend: She thought the president was monitoring her
A law enforcement source involved in the investigation said Thursday that Carey's boyfriend had told police last winter that she appeared to be delusional. The boyfriend said she claimed the president had placed Stamford, Connecticut, where she lived, under lockdown and that her house was under electronic surveillance, the source said.
He told police that she was suffering from postpartum depression, was having trouble sleeping and was on medication. Carey underwent a mental health evaluation, the source said.
Authorities have not officially linked the incident to mental illness or any other factor.
PHOTOS: Shooting near the U.S. Capitol (http://bit.ly/1c9My4u)
Carey lived in an apartment that authorities searched Friday.
During the search, authorities found a medication to treat schizophrenia and bipolar disorder, and another medication that is an antidepressant, according to the law enforcement source, who was briefed on the investigation. They also found a laptop computer, a flash drive and three non-working cell phones.
The source told CNN that Carey left a letter addressed to the boyfriend at her apartment and that it appeared to contain white powder. The letter was being tested for hazardous substances.
The baby girl
The 1-year-old child survived after a police chase in a black Infinity sedan driven by Carey. Authorities have placed the girl in protective custody.
New York relatives
In Brooklyn in New York City, where Carey's mother and one of her four sisters live, a neighbor reported seeing the suspect Tuesday picking up her daughter. When federal agents arrived to conduct questioning, no one at the apartment answered the door.
™ & © 2013 Cable News Network, Inc., a Time Warner Company. All rights reserved.
One person will win a three-year lease on a 2013 Honda Civic Lx Sedan automatic.
Click to see the latest mugshots, plus this week's wanted fugitives.
This feature packed upgrade brings you faster performance, easier navigation, and stunning improvements to photos, video and readability.
Latest News Stories
Runners gathered in downtown West Palm Beach for the 2013 Palm Beaches Marathon on Sunday, December 8, 2013.