The former chief of a volunteer fire department in Allegheny County and his wife are at the center of a criminal investigation involving a junior firefighter.

Investigators say this case surfaced during a separate theft investigation involving former Fair Oaks Volunteer Fire Chief Nathan Turner. A police officer with the Sewickley Borough Police Department was reviewing data from a Sewickley Water Authority-issued phone to Turner when he found a text thread between Turner and his wife, Stephanie Turner.

The water authority confirmed Nathan Turner was let go in August because of the theft cause but could not comment further.

According to the criminal complaint, the messages contained conversations between the couple that involved a junior firefighter who was 14 years old at the time. Tur

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