Monster math teacher posed as student, used fake identity & burner numbers to send sick messages to 12-year-old, charged
Florida – A criminal case that began with a child’s plea for help has now widened into one of the more disturbing investigations to emerge from Northeast Florida this year, ending with a private school teacher and coach in jail under a mountain of charges.
Authorities say the accused, 34-year-old Johnny Robinson III, was not simply sending abusive messages from behind a screen.
Investigators allege he carefully built a false identity, used technology to stay hidden, and repeatedly targeted a 12-year-old girl over a period of months.
The investigation dates back to December 2025, when the girl approached a School Resource Officer and reported that she had been receiving a relentless stream of s**ually explicit messages and images.
At first, the source appeared unclear. But according to investigators, the person behind the messages was allegedly working to gain her confidence by pretending to be another student.
Detectives say the conversations were designed to feel authentic, with the sender referencing real classmates and friends from the victim’s life in order to make the deception more convincing.
What followed, authorities say, was not a one-time incident but an extended pattern of digital harassment. Investigators believe Robinson used Voice over Internet Protocol technology to conceal who he was, allowing him to create and cycle through multiple internet-based phone numbers.
That tactic, officials say, made it harder for the girl to cut off contact. Each time she blocked one number, another would appear, and the messages would continue.
According to the Clay County Sheriff’s Office, the harassment stretched from November 2025 into January 2026, turning the victim’s attempts to escape into a repeated and exhausting loop.
Detectives with the Internet Crimes Against Children Unit eventually traced the digital activity back to Robinson’s personal devices, a breakthrough that shifted the case from troubling complaint to criminal prosecution.
Robinson, who worked as a math teacher and athletic coach at Temple Christian Academy in Jacksonville, was taken into custody on Wednesday, April 15, 2026. He was initially charged in connection with transmitting harmful material to a minor and unlawfully using a communication device. But the case quickly deepened after investigators conducted a forensic examination of his cell phone.
On April 16, authorities announced that dozens of additional charges had been added after child s**ual abuse material was allegedly found on the device.
The result was a sharp escalation in the case, pushing the total number of criminal counts past 50. Robinson is now being held at the Clay County Jail, where his bond has been set at more than $375,000.
The school where he worked moved swiftly after learning of the arrest. Temple Christian Academy confirmed that Robinson’s employment was terminated immediately.
In a public statement, the school said, “Late Wednesday evening, we were notified that one of our teachers had been arrested. As a result, their employment with our school has been terminated… The situation is now in the hands of the proper authorities.”
School officials also sought to reassure families as news of the arrest spread. According to the academy, investigators told the school that none of the current allegations involve students enrolled there.
Even so, the arrest has cast a long shadow, raising painful questions about trust, access, and how predators can attempt to operate under the cover of ordinary roles.
What began as a child reporting disturbing messages has now grown into a sweeping criminal case centered on digital manipulation, alleged exploitation, and evidence investigators say was hiding in plain sight on personal devices.
As the prosecution moves forward, the case stands as a stark reminder that online predation can take shape through persistence, false familiarity, and calculated deception long before the person behind it is finally exposed.
