The heart attack is listed as this in the report:
Posted on: June 4, 2020 at 11:16:05 CT
DC Jayhawk KU
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"CARDIOPULMONARY ARREST COMPLICATING LAW ENFORCEMENT
SUBDUAL, RESTRAINT, AND NECK COMPRESSION "
I think the medical evidence you're seeking is that sentence. The coroner is saying that the restraint and neck compression were factors.