The autopsy of the 53-year-old who died in a police operation in Neustadt an der Weinstrasse did not clarify the cause of death.
No evidence of external violence was found, which is why the man probably died of a heart attack, the public prosecutor and police announced on Tuesday.
Further histological and toxicological examinations are therefore being planned to clarify the cause of death.
Neustadt an der Weinstrasse - The man died last Wednesday after the police used a taser against him.
The man had behaved aggressively before using the taser, it was said.
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A taser is a device used to deliver electric shocks that cause painful muscle contractions.
This renders a person incapable of acting.
If Tasers are used against people with heart disease or cardiovascular problems, this can have health consequences.
dpa