A former Cherry Creek School District teacher was arrested Monday on suspicion of child sex assault after a former student came forward, police said.
Robert Combs, 56, was arrested on investigation of five counts of sexual assault on a child by one in a position of trust and three misdemeanor counts of abusing public trust as an educator, according to Arapahoe County court records.
Combs was a CTE Engineering and Technology Teacher at Grandview High School, 20500 E. Arapahoe Road, between 2002 and late 2025, according to a letter sent to parents and families by the Cherry Creek School District.
The school district placed Combs on administrative leave in October 2025, when Grandview Principal Lisa Roberts was first made aware of the sexual assault allegations by the Aurora Police Department, police wrote in his arrest affidavit. Combs was officially “separated” from the school district on Nov. 13, according to the letter sent to parents.
“The safety and security of our students and staff is our highest priority,” school district officials wrote in the letter. “We appreciate your partnership in these critical efforts. We are committed to keeping you informed about all aspects of your child’s education.”
Aurora officers responded to Grandview High School on Oct. 30, after a former student reached out to Roberts to apologize for lying to her in 2022 and said they were considering reporting Combs, according to the affidavit.
The student previously denied having an inappropriate relationship with Combs to Roberts in 2022 after a security guard and other teachers came forward with suspicions about the nature of the two’s relationship, the affidavit stated. At that time, the student said Combs was “like a father.”
Roberts encouraged the student to report Combs and also contacted the Aurora Police Department in October to report the incident on her own, according to the affidavit.
The unidentified victim first met Combs in August 2021 when the student joined a high school club the man advised, the Technology Student Association, according to Combs’ arrest affidavit.
Other teachers at Grandview High School also recommended that the student reach out to Combs for assistance with getting into a military academy, police wrote in the affidavit. Combs helped the student with interview preparation, essay writing and physical training.
In February 2022, Grandview students and staff attended the association’s state conference in Denver, according to the affidavit. Combs allegedly encouraged the then-underage student to come back to his hotel room, where they kissed and he “expressed romantic feelings” for them.
The victim told Aurora Police they “felt shocked and unsure how to respond,” according to the affidavit.
Combs’ interactions with the student after the conference “became more frequent and increasingly inappropriate,” police wrote in the arrest affidavit.
The student would meet Combs after school to work on applications, and those meetings often turned intimate, the student told police. Combs also sent the student inappropriate photos and text messages.
Combs and the student had sex in classrooms, offices and closets at the high school almost every day between March 2022 and May 2022, according to the arrest affidavit. They would also drive to empty parking lots and have sex in cars.
The student told police that it felt like they “owed” Combs for his help, the affidavit stated.
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Police advised Roberts of the specific sexual assault allegations made toward Combs late that month, at which point Combs was suspended and escorted out of the school, according to the affidavit.
Combs is next scheduled to appear in court on March 20 for a preliminary hearing, court records show. He posted a $50,000 surety bail on Monday.
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