OKLAHOMA CITY -- The preliminary hearing for former high school band teacher Jeremy Smith has been postponed until September 7. He was due in court today.

Smith was arrested last May on rape charges after allegedly having a relationship with an 18-year-old student at Duncan High School.

Investigators say they found out what was happening after the student lost her cell phone, which contained explicit messages from Smith.

According to a probable cause affidavit, both the 18-year-old student and Smith confirmed that the sexual acts did occur on at least three occasions.