COCOA BEACH, Fla. (CBS12) — A late-night lie unraveled a secret relationship, leading to the arrest of a Florida math teacher accused of sexual misconduct with a student.

Deputies with the Brevard County Sheriff’s Office say the investigation began in March when the parents of a student at Cocoa Beach Jr./Sr. High School reported that they believed their son was having a relationship with his 37-year-old math teacher, Kirsten Rose, after he was late coming home from work one night.

When the parents checked his location, they reportedly noticed that he was at a home that was unknown to them. When questioned, he said he was at his girlfriend’s house, but didn’t disclose her identity.

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Investigators say continued questioning led the teen to admit he was in a relationship with his teacher.

Agents with the Special Victims Unit launched an investigation, and deputies say evidence revealed the student and Rose began communicating outside of school through Instagram in November 2025.

Deputies say those conversations continued into early 2026 and allegedly turned sexual on multiple occasions in February and March.

Based on the findings, deputies secured an arrest warrant. Rose was booked into the Brevard County Jail on counts of Lewd and Indecent Exposure Offenses against a student by an authority figure and five counts of unlawful sexual activity with a minor.

Rose is currently being held without bond, per court documents.