The conditions of the car crash per the NYT:

Mr. Orta died in a fiery car crash at around 1 a.m. on Saturday when he lost control of the vehicle he was driving and struck a utility pole. The car caught on fire and Mr. Orta died before the three other people in the car, including a stepsister, were able to pull him out, Mr. Arriaga said. The crash over the weekend had no connection to the shooting last March.

According to a preliminary San Antonio police report, which did not name Mr. Orta, the person behind the wheel was driving “at a high rate of speed” when he attempted to exit the highway and lost control of the vehicle.

Mr. Arriaga got an alert on his phone about the crash and headed to the scene. When he arrived at around 1:30 a.m., he saw a charred vehicle and his injured daughter. “The three of them got out and they were trying to pull him out, but then it exploded,” Mr. Arriaga said.

Mr. Orta’s stepsister, who suffered several bruises and burns, remained at the hospital, Mr. Arriaga said.

Cars don’t explode like in movies

It’s also a huge vulnerability that modern cars have internet connections and could easily trigger the immobilizer or drive got into a wall

There are only a handful of models that use a drive-by-wire system where an electronic attack would let you do something like that (Teslas and some models of Humvee are the only ones I know right off I was wrong, both models I was thinking of would not allow this either. There’s only four models in the US where this would be possible.) - pretty much everything else still uses supplementary physical connections to prevent loss of control during a hardware failure. Loss of steering assist or activation of an immobilizer will cause your engine to shut down and your controls to be less responsive, but it does not cause you to lose control of a car and both have a long enough purely mechanical delay to allow you to safely stop the vehicle.

There’s no way for a remote attacker to “drive your car into the wall” unless you’re using one of those very rare models. Even cars with lane assist are designed so that -mechanically- they cannot override user input.

a handful of models

I’m not saying they did him in because that’s just a conspiracy theory, but your claim is a touch outdated.

Anything that has lane assist or parking assist, on any model has buss managed controls.