

If it’s anything like the e-pedals used in Subaru and Honda vehicles, they have two different independent position sensors in the pedal. The ecu monitors both, and the value from both must match. If there is a discrepancy, it uses the lower value or zero. So it’s extremely unlikely the pedal could malfunction in a way to show 100% pressed.
But I don’t know if Tesla does the same.



TL;DR
The victim was born in Vietnam, is a citizen of Australia, went to USA in 2013 on a 2 year visa, that expired in 2015, he has been living in USA since then.