Dale Burns died after police officers shot him three times with a taser. The incident in Barrow-in-Furness has led to renewed worries about use of the “non-lethal” weapon.
Up to eight officers confronted Dale Burns, 27, after being called to reports of a disturbance at his home on Tuesday of last week.
Police arrested him, then used pepper spray on him before one shot at him three times with the 50,000 volt gun.
The Independent Police Complaints Commission is investigating the events.
British police have been able to use tasers since 2004.
Amnesty International has recorded the deaths of more than 450 people in the US after they were hit by a police taser. Most of them were unarmed.