A critical incident investigation has been declared after a man with "self-inflicted knife wounds" was tasered by police and died on the Central Coast.
Police were called to Terrigal Drive, Erina just before 4pm on October 17 following reports of a concern for welfare.
Brisbane Water police arrived and found a man armed with a knife, with wounds to his body, a police statement said.
Police tried to speak to the man, who they said was still armed with the knife, and when he refused police directions a taser was deployed.
The man was treated by police before paramedics arrived, who treated the man for "self-inflicted knife wounds"; but he died at the scene.
While the man is yet to be formally identified, he is believed to be aged in his 50s.
A crime scene has been established and a critical incident team from Tuggerah Lakes Police District is investigating the circumstances surrounding the incident.
The investigation is also subject to an independent review.