Emergency services returned to the scene of last month's fatal Porirua siege, where a house at its centre was badly damaged in a blaze late on Sunday night.
A police spokesman said the fire - at the Kokiri Cres property where former Hawke's Bay man Pita Tekira shot police dog Gazza - was being treated as suspicious.
Mr Tekira, who was on bail for dishonesty, driving and violence offences but had removed his electronic monitoring bracelet and absconded from the Bay, was later found dead at a house on the street.
A fire communications spokesman said four fire crews were sent to fight the blaze. Police cordoned off part of the road. There were no reports of anyone being injured in the fire.
A witness at the scene said about midnight that the blaze had been bad, but appeared to have been put out.