A former middle school substitute teacher has been arrested on four counts of child pornography, according to the Orange County Sheriff's Office.

Zachary Grenier was a substitute teacher at Walker Middle School in Pine Castle.

Grenier has been arrested on two counts of transmission of child pornography by electronic device or equipment, and two counts of unlawful possession of material depicting sexual performance by a child.

Orlando Police Department detectives executed a search warrant to search specific Snapchat accounts, which led to Grenier's arrest, according to court documents. They also found sexual conversations between Grenier and a female who stated in the chat that she was 15 years old.

The Orange County Sheriff's Office believes the crimes were committed between Sept. 17,

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