RICHMOND, Texas — A former Missouri City, Texas, police officer charged with involuntary manslaughter for a fatal crash that killed a mother and her son was arrested Wednesday, according to the Fort Bend County, Texas District Attorney’s Office.

Blademir Viveros, 27, was charged with two counts of involuntary manslaughter and one count of aggravated assault.

His bond was set at $250,000 for two counts of involuntary manslaughter and $300,000 for aggravated assault; $800,000 in total.

Authorities said Viveros shot the victims on June 20, responding to a robbery call in progress.

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According to police, a man armed with a handgun approached the victim and stole $200 before fleeing in a silver Honda Civic.

Meanwhile, Viveros was heading east. Stewarts pulled from Dollar Tree parking lot. That’s when the officer T-boned his vehicle, police said.

Both mother and Houston school counselor Angela Stewart, 53, and her 16-year-old son, Mason Stewart, died at the scene.

Authorities said Viveros was exceeding the posted speed limit and his emergency lights were not on.

Family members told ABC Houston affiliate KTRK He said the crash happened on Mason’s 16th birthday.

On Wednesday, Attorney Jack Nugent shared the following statement from the Stewart family.

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“We are still heartbroken beyond words for the tragic and senseless loss of our beloved wife, mother, brother and son. Angela and Mason were taken from us too soon due to the conscience-shocking actions of a police officer. The indictment is only the first step toward accountability.” We offer our deepest gratitude to those who continue to support us during this difficult time and we hope that our fight will serve as a constant reminder that life is precious and justice is necessary and that others will continue to do so. “We will continue to support any action that will help in any way to prevent it from suffering devastating losses.”

The prosecutor’s office said Viveros’ court date has not yet been set.