Now, almost four months later, no public arrests have been made in the death of the fallen officer.
Shirley's parents say they know investigators are working hard on the case, but they are pleading for more answers and justice for their son.
“110 days of me getting up every morning and looking at my wife and lying to her and telling her 'Today's going to be the day, today's going to be the day baby' and going to bed at night telling her tomorrow is going to be the day lying to her again to give us some kind of semblance of hope here,” says Shirley’s father Brian Shirley.
All the Shirley's think about is finding out what happened to their son.
Shirley's parents say initially they were told by the Louisville Metro Police Deparment (LMPD) that video footage confirmed that the officer was ambushed.
They say with the past three months the story has changed. They say investigators told them their son might have been the victim of a robbery and later a carjacking.
“Now there's a complete 180 to it may have been an accident. We don't understand how you get from point A to point Z with nothing in between and that's where we're struggling because they're not being transparent with us,” says Shirley.
The Shirley family says they know investigators are putting forth their best effort but they are frustrated that the lead detective told them not to contact him about the case.
“We're not mad at the police by no means we're just here to get answers on what's going on with our son's case and it's that simple,” says Shirley.
They plan to do everything they can to find out who killed their son.
“We're not going to stop trying, we're not going to give up. Our son deserves justice,” says Shirley.
In a statement, LMPD says it has the same goal and that members of the command staff have remained in contact with Deputy Shirley’s family.
“The LMPD is committed to bringing Deputy Brandon Shirley’s killer or killers to justice. Balancing the integrity of a murder investigation versus the very real needs and desires of survivors’ families is an excruciatingly difficult, constantly evolving process.,” the statement reads. “Our commitment is to the strongest possible level of investigation, free of outside influence, bias, or opinion.”
The Shirley family is adding $10,00 to the existing $80,000 reward for information leading to the arrest and conviction of those involved in the death of the officer.
Anyone with information should call the FBI at (502) 263-6000, ATF at (888) ATF-TIPS or LMPD at (502) 574-LMPD.