1654 (pre): Deposition to the Academic Senate of Copenhagen
Sometime previous to 1654, when an account of this event was printed, the Academic Senate of Copenhagen was sent a deposition about a person who died by belching flames and then being consumed.
Not Enough Details
The above vague reference is from Thomas Bartholin's Historiarum Anatomicarum Rariorum, published in 1654. Specifically, this is mentioned after Bartholin describes the death of a Polish soldier who vomited flames, after which Bartholin simply stated that the Academic Senate of Copenhagen had heard of something similar. So there are actually no details at all about the case other than it resembles another account that was given... so it may as well not have been mentioned.