An Iranian national will face court this morning charged over a fatal stabbing in Sydney's west.

The 35-year-old, who police say was born in Afghanistan, was charged overnight with murder and wounding with intent to murder.

He allegedly stabbed two of his housemates, aged 41 and 26, at their unit at Berala in the early hours of Thursday morning.

Both men were taken to Westmead Hospital, but the older man died a short time later.

The charged man was held in custody last night and is due to face Burwood Local Court today.

Federal Opposition immigration spokesman Scott Morrison clashed with Immigration Minister Tony Burke over the stabbings yesterday after it emerged the charged man is in Australia on a bridging visa.

"This is a very concerning and a very disturbing development," Mr Morrison said yesterday.

Mr Burke said Mr Morrison was trying to politicise the issue and refused his demands for more information, saying that decision would rest with police.

Detective Inspector Paul Arnold made it clear yesterday that the charged man's immigration status was a low priority for investigators.

"What we're interested in is establishing the nature of the events that took place," he said.