A manhunt is under way in northern Tasmania after a man was killed and a woman critically injured in a double stabbing.
Police say a man known to the pair broke in to the house in the Launceston suburb of Ravenswood about 3.30am on Thursday.
Two teenagers, the woman's children, were at the house when the stabbing occurred but were unharmed.
Tasmania Police Inspector Mel Grove said one of teenagers called police.
"It's caused significant distress to them and it is a shocking incident," she told reporters in Launceston.
"They are in good care and are going to be provided with ongoing support from various services. Our thoughts are obviously with them."
Police released an image of Kerry Whiting, 44, who they say may be able to help with inquiries.
"Kerry we would like you to hand yourself in. We want to bring this to a safe resolution," Insp Grove said, adding he is not believed to be a threat to the wider community.
A helicopter, drone and specialist police are involved in the search.
Insp Groves wouldn't comment on the alleged stabber's relationship with the man and woman.
Police found a car of interest, a black Nissan Murano wagon with the Victorian registration HOOKAH, late on Thursday afternoon.
The man, aged in his 30s, died at the scene, while the woman, also in her 30s, is being treated at Launceston General Hospital.