Northern Territory police have charged the man suspected of a shooting rampage in Darwin with four counts of murder.

Four men died and a woman was injured after being shot in the leg on Tuesday night.

Police said they expected to lay further charges against the 45-year-old man at a later date.

The man has been remanded in custody to appear via video link in Darwin local court at 10am on Friday.

He also faces two counts of recklessly endangering serious harm and one charge of criminal damage.

More details of the victims emerged on Thursday.

One was the 52-year-old New Zealand national Robert Courtney, a security guard at a Darwin casino.

A second, Michael Sisois, 57, was shot dead in the car park of the Buff Club on the Stuart Highway on Tuesday night.

On Wednesday the identity of another victim was revealed – Hassan Baydoun, 33, a taxi driver from Darwin who had been staying at the Blue Palms motel. The fourth victim has been named as Nigel Hellings, 75.