The off-duty deputy involved in a fatal shooting on Saturday has been identified as Deputy Anthony Thomas. Thomas, a 16-year-veteran of the Bexar County Sheriff's Office works in court security according to the department.

The shooting happened just after 5 a.m. Saturday along Loop 1604 between the Nacogdoches exit and the I-35 interchange, near Lookout Road.

Authorities said Thomas, the off-duty deputy was believed to have been involved in a minor crash, when he and another man identified as 29-year-old Mathew Jackson in the other vehicle pulled over.

There was an argument, and at some point, the deputy apparently felt threatened and fired multiple shots at Jackson, according to the Bexar County Sheriff's Office.

Jackson's brother Patrick said his brother leaves behind a wife and a two-and-a-half-year-old son.

Please keep asking questions. This is not adding up, Patrick Jackson told KENS 5 via text message Monday afternoon.

Family and friends who gathered in Schertz to remember Mathew declined to be interviewed on camera.

A spokesperson said the deputy was in his personal vehicle and had just left a security job, so he was off-duty at the time.

No word on whether the deputy was in uniform or if he identified himself as a peace officer before the shooting occurred.

The deputy was placed on administrative leave as the sheriff's office investigates.

Per standard practice for deputy-involved shootings, those findings will then be sent to the district attorney's office.

A criminal background revealed Jackson was arrested in 2003 for marijuana possession. That charge was later dismissed.

He was convicted of evading arrest in 2005.

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