TAMPA, Fla. -- A Hillsborough County sheriff's deputy was involved in a fatal traffic crash that killed a 15-year-old boy, according to the sheriff's office.

The agency said the crash happened about 6:30 p.m. Friday near 124th Avenue E. and Florida Avenue N.

Chief Deputy Donna Lusczynski said the deputy was headed north on Florida through a green light and saw a person walking a bike across the street. The deputy swerved to avoid striking them, but hit a 15-year-old boy walking with the other person.

The boy died from his injuries.

The deputy was in an undercover car. He has been with the force for more than 5 years, Lusczynski said.

A woman on the scene who identified herself at the boy's mother described him as a "good big brother" and said he was excited to start high school.

Make it easy to keep up-to-date with more stories like this. Download the 10 News app now.

Have a news tip? Email tips@wtsp.com, visit our Facebook page or Twitter feed.