Taser International disputed this, arguing Turner had a pre-existing risk of cardiac arrythmias of a type exacerbated by drugs — and that he was carrying marijuana. (newscientist.com)
When potassium levels get high heart arrythmias occur or even heart stoppage which also is fatal. (vetinfo.com)
Benign lipomatous infiltration (Nonencapsulated adipose tissue forming a lipomalike mass, usually in the interatrial septum of the heart, where it may cause arrythmia [abnormality in the rhythm of heartbeats] and sudden death) of the salivary gland has been reported in dogs. (wearethecure.org)