hallinan's office was frankly a mess. >> harris had worked under hallinan years earlier.new she could clean up the mess. it was a gritty campaign. she needed someone to take charge. >> our mother was feisty and a force of nature. our mother put her whole heart into anything that we put our minds to. >> after a historic runoff with her mother standing by her side, harris became the first black and south asian woman d.a. in san francisco. former adviser debbie mesloh remembers harris was not going to cherish the victory sitting down, because she couldn't. >> no desk, no chair, no filing cabinet, nothing. it was just very kamala. just grab a chair from the reception and start working. >> the work would get serious fast. >> i got the call that a police officer had been killed in the line of duty. >> 29-year-old isaac espinoza was gunned down in the gang-ridden neighborhood of bayview. >> isaac was an amazing cop. he is the type of person that you would hope would be out there protecting your community. >> an arrest was made the next day, but the sting of espinoza's death got