The Marine veteran, who survived two tours in Iraq, was one day away from turning 35 years old.
On Friday, hundreds of police officers, friends and family gathered to dedicate a memorial to Ofc. Fox.
The sight is below a rail embankment next to the Schuylkill River Trail where Fox was fatally ambushed as he pursued a gunman.
"A courageous man chased down evil and gave his life on these rocks a few steps behind me," said Risa Ferman, Montgomery County District Attorney.
Chief Joe Lawrence repeated a radio dispatcher's effort to contact Fox, call sign 44-178, which was met with silence that fatal night.
"Every officer that heard that silence knew that there was something wrong," said Chief Lawrence.
Ofc. Fox was posthumously awarded the county's Medal of Honor by the D.A.
"I have never given it before, and I must tell you I hope to never give it again but I hope you will display it proudly," said Ferman.
Much of what was said Friday was directed to Fox's family. Among them his widow Lynsay and their children Kadence, and Brad Jr. who was born months after his father was killed.
In Brad Jr.'s stroller - a doll made with a picture of his dad.
The memorial to Ofc. Fox is flanked by two benches. Fellow offers hope people will stop and reflect on the man it honors.
"It's nice people stop and talk to us and ask us questions about Brad and who he was, not about how he died but who he was as a person," said Lt. Karen Mabry.