Kerr Day was able to make it to the police parking lot on her own, without any help from the emergency call taker, but there she ended up blocked by an iron gate.
With nowhere to go, Kerr Day sat in her car, still frantically begging for help and hoping for police to arrive. Her lifeline began to sound frustrated.
"Stop yelling because I can't help you if you're yelling," the Plantation call taker said.
"I'm stuck now. He's going to kill me," said Kerr Day, who had been speaking with the Plantation call taker for one minute and 34 seconds.
Those were her last words. The chase ended with her muffled screams -- literally at the police department's front door.
Surveillance cameras captured Kerr Day running out of her car with Cevallos behind her, gun in hand. He shot her in the back and then again after she fell to the ground before he took his own life.
Kerr Day was rushed to the hospital but died on the operating table before her children were ever told about the shooting.
"We deserved that last moment to touch her body one last time warm," said Edward Kerr.
Cevallos had no real criminal record, just a DUI arrest years ago. He left behind a revealing suicide note in Spanish, in which he declared his devotion to Kerr Day.
"I've made a decision to put an end to my life next to my partner, Olidia," he wrote.
Police also found a receipt from a local gun range where Cevallos went for target practice the day before the bloodbath. He had 30 rounds of ammunition in his car.
Kerr Day's family was further devastated when they heard the chilling tape of their mother's 911 call, where for more than three and half minutes Kerr Day could be heard begging for help. No attempt was ever made to send someone to her aid.
"The complete fear in her voice, it just didn't sound like her," said Elizabeth Kerr. "It sounded like a different woman."
Kerr Day's sister, Ada Perez, thinks the call taker's attitude, tone and line of questioning were completely uncalled for.
"I was so angry when I heard that 911 call," she said. "She's the one that did wrong, the 911 call taker at Plantation. She's just as much to blame for my sister's death as Cevallos is."
Plantation Chief of Police Larry Massey defended the actions of the 911 call taker.
"This is not a case of willful misconduct. I don't even think it's a case of professional negligence on the part of the dispatcher," he said in an exclusive interview with "20/20." "She had to handle a very difficult situation in an environment where she didn't know where the caller was. I wish things turned out differently, but I still stand behind the dispatcher. I think she did a reasonable job."
No one was disciplined in Massey's department as a result of what happened to Kerr Day. But after her murder, the chief ordered a complete overhaul of training and procedures in the communications center.
Kerr Day did everything she could to save herself and protect the most important things in her life -- her children, who she called her angels.
"She prevented a bloodbath. She was smarter than everybody in this case," said Edward Kerr. "She did everything right. She did their job for them. She took him to be arrested at the station."