Those on the scene certainly thought this was the case, which is basically the only reason they use that drug in the first place in the context of an arrest. I

Those on the scene certainly thought this was the case, which is basically the only reason they use that drug in the first place in the context of an arrest. I don't claim to know one way or another whether they were right, but I would note that dying of a heart attack is inconsistent with ketamine as the cause. Maybe they gave him too much, but the article leaves one to conclude that this was somehow related to his death even though it never actually says so.