The crash killed Heitmann as well as a 43-year-old woman and a 12-year-old girl in a sedan he hit.
Trevor Heitmann, 18, drove his high speed $500,000 McLaren the wrong way down a freeway at 100 m.p.h.
"At the time of the crash, he could have been going over 100 miles per hour", CHP Officer Jake Sanchez told the newspaper.
The fiery crash happened on the I-805 HOV in San Diego, Calif., on Thursday.
He gained fame as "the King of Skins" who designed and sold customised content for the first-person shooter game, Counter-Strike: Global Offensive.
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Heitmann is popular on YouTube, and has close to 900,000 subscribers on his channel.
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.
Trevor "McSkillet" Heitmann posted video of his 2014 McLaren sports auto in December. He was later trade banned by Valve, who make CS:GO, because of his involvement in skin gambling website CS:GO Magic. Police had responded to Heitmann's home in Sea Knoll Court earlier Thursday after his dad said the teen sped off, hitting another vehicle; seems Heitmann then smashed through the gate of an elementary school and broke a window before driving away, per Fox 5.
Witnesses reported seeing the driver of a black sports auto slam through the gate, get out of the vehicle, smash a window on a school building and speed out of the campus parking lot.
The woman who was killed was Aileen Pizarro, Fox 5 reported Friday.
Police believe Heitmann was involved in another auto-related incident Thursday afternoon.