A man who was shot by police with a Taser gun has died after injuring himself.
The man had inflicted a serious injury on himself, police said
Police were called to a house in Goldington, Bedford, after reports of a dispute between a mother and her son.
The man, who was already injured, threatened the officers with a knife and was shot with the stun gun before going back into the house.
He was then found with further self-inflicted wounds and was taken to hospital where he died.
The Independent Police Complaints Commission (IPCC) has been informed and is likely to investigate the incident, which happened at 1900 GMT on Saturday.
A post-mortem examination to determine the cause of death is due on Monday.
A police spokeswoman said: "Armed officers went to the address after being called to a domestic dispute involving a mother and son.
"On arrival at the property, police found the man in his 30s suffering from injury and armed with a knife.
"He threatened officers and, as a result, the taser was discharged.
"The man then retreated into the house alone and when found shortly afterwards by police officers, he was in need of urgent medical attention because of subsequently self-inflicting serious injury to himself."
Terry Banthorpe, a neighbour, said the man who died had been threatening his own mother with a knife.
He said: "We had our door open and heard the quiet, muffled voice of an old lady saying that her son was trying to kill her."