Tulsa Police say they've talked to more than a dozen young girls about their relationship with Bradley Morris, a former choir director at Edison High School.
He's been charged with sexual battery, based on complaints from two victims.
But police say another girl described a crime that's outside the time limit for prosecution.
The detectives for Tulsa Police working the case say something was going on for a long time, but nothing was reported to them until last November.
A parent told us today he reported inappropriate activity to the school district two years ago; shortly before Morris quit his job.
Bradley Morris was the choir director at Tulsa's Edison High School until 2011. The school district says he started work there in 2000, but abruptly resigned because of an unspecified personnel issue.
A parent of one of Morris's former students, said he reported Morris to the school district about that time.
"Touching my daughter. Don't come up hugging all over my daughter. Just doesn't seem appropriate for a professional, and then when I saw the pictures on Facebook, it just painted the whole picture I was already fearing," the father said.
He said he found inappropriate pictures on Facebook and text messages from Morris to students.
"Where there's smoke, there's fire. There was something of this guy that just reeked, not good," the parent said.
Tulsa Police say it was more than that. Their investigation started last November, after Morris' behavior was first reported to them.
They say one incident is reported to have happened on the Edison Campus, and others in the parking lot of a Staples store.
"He would really become their friend, more of a friend than a teacher, and we've read some things, some things you really wouldn't consider to be appropriate for him to be discussing with a student," said Sgt. Mark Mears.
Police say they've talked to a dozen girls, who described incidents that either don't rise to the level of prosecution or where victims are unwilling to testify.
In fact, they say it wasn't a victim who reported it, but a third party who named names.
"You can't prosecute someone based on rumors. We actually have to find a victim that's willing to prosecute," Mears said.
Since 2011, Morris has worked as a writer at Urban Tulsa Weekly.
He remains in jail on $250,000 bond.