JACKSONVILLE, Fla. -

A security guard at a Jacksonville high school is accused of unlawful sexual activity with a teenager on campus.

According to a police report, 25-year-old Douglas Tilley was arrested in January, but details weren't released until Channel 4 made a request under Florida public records law. Even then, Channel 4 can't show the suspect's picture because he's related to a police officer.

Students at Frank H. Peterson Academies of Technology describe Tilley as a nice, personable guy.

"He was a young security guard," one senior said. "He talked to a lot of students. He was a friendly guy."

The senior, who didn't want to be identified, said she knew Tilley as someone who was close to the students. According to the police report, Tilley got too close to at least one of them, and he is charged with unlawful sexual contact with a victim 16 or 17 years old, a felony.

Tilley committed the crimes on school property at 7450 Wilson Blvd. on the Westside, according to the report.

He also is charged with transmission of material harmful to minors, also a felony. The 18-year-old said Tilley used to communicate with students with the app Snapchat.

"You should not snap with teachers or security guards, because they are authority figures," she said.

"It makes me feel that we should hire older staff members in schools like this, because maybe he wasn't mature enough to handle the environment," said Cephas Bradley, a Peterson graduate.

Detectives believe the crimes took place in December. Tilley was arrested in January. His jail mug shot is not available, because he's a relative of a police officer.

Students said until Channel 4 uncovered the documents Monday, they never knew what happened.

"No, they didn't tell us," the senior said. "He just disappeared. ... I wish they would have told us."

The Duval County School District is looking into it.

"We did what we were supposed to do. When we found out about the incident, we immediately terminated the employee," Superintendent Nikolai Vitti said. "The employee never stepped foot again in our school system or in that school. We did the right thing when we learned about the situation."

Tilley's father didn't want to comment about the allegations. Tilley's attorney said he can't comment, and he and his client are working on a resolution to the case.