The sports vehicle was traveling southbound in the northbound I-805 carpool lane at a high rate of speed when it hit a 2010 Hyundai SUV traveling northbound on I-805 near La Jolla Village Drive, according to CHP and the San Diego County Medical Examiner's Office.
The online star, who called himself McSkillet, was reportedly driving faster than 100mph when his £200,000 McLaren sports vehicle crashed head-on into an SUV, killing its driver and passenger.
The San Diego Medical Examiner confirmed Heitmann died due to "blunt force trauma".
Other gamers noted on Twitter that Heitman had become depressed before the crash, because Counter Strike's developer banned the selling of skins - effectively ending Heitman's business.
The fiery crash happened on the I-805 HOV in San Diego, Calif., on Thursday. The vehicle matches the description of the auto involved in Thursday's crash.
The social media star had nearly 900,000 YouTube subscribers and his videos had more than 205 million views. In December, he posted a video of the McLaren he bought, explaining that he used funds from skin trading and monetizing YouTube videos.
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It was unclear what led up to the wrong-way collision, but about 30 minutes prior to that crash, a McLaren slammed through the gates of an elementary school in the Carmel Valley area before speeding off, according to the San Diego Police Department.
A few minutes before the crash, local San Diego news outlets reported a black McLaren slamming through the gate of an elementary school and almost hitting some witnesses, although nobody was injured.
"I really am devastated that one person's actions could take my family away from me", mourned Dominic Pizarro, son of Aileen and brother of Aryana, according to NBC. He was later trade banned by Valve, who make CS:GO, because of his involvement in skin gambling website CS:GO Magic.
The woman who was killed has been identified as Aileen Pizarro, according to Fox 5 News.
The sports auto was also involved in an earlier incident where it drove into the fence of an elementary school but no one was injured.