'Excited delirium' behind in-custody death

No "anatomic or toxicological" causes of death were found, autopsy documents show. Drug tests revealed only the presence of THC, a chemical found in both prescription drugs and marijuana. The body showed no signs of external injury. The Kentucky medical examiner's office concluded excited delirium killed Gibson.
Excited delirium typically affects those who suffer from mental illness or use illicit drugs. It can manifest as extreme hostility, agitation, super strength and erratic behavior.