The boyfriend of a blood-soaked mother who was allegedly dumped and left for dead at hospital after being shot has been charged with murder.

Police allege the 32-year-old man dumped the 42-year-old wounded mother outside Sunshine hospital before driving off in an eastward direction last night.

But he only made it a few hundred metres before crashing near the Western Ring Road.

It's alleged he then hijacked a Toyota Ute, only to crash again near Cooke Avenue, where he was eventually arrested.

Police allege he was found with a stashed gun.

Cars were flipped over in the crash outside the hospital.

The street was placed in lockdown after the shooting.

Two women, aged in their 30s and 50s, were injured in the accidents leading up to the suspects arrest.

Both were taken to hospital with minor injuries.

The man has tonight been charged with murder, carjacking, attempted carjacking, robbery, attempted robbery, conduct endangering person and prohibited person possess firearm.

He will appear in court tomorrow.

CCTV shows police pursuing the allegedly hijacked car on the wrong side of Furlong Road, about 150m before the crash.

A Man has been arrested over the shooting.

A woman was shot dead outside the hospital.

Further security footage shows police searching a property and empty home next to Sunshine Hospital between 9.40pm and 10.15pm.

Homicide detectives spent part of the day searching a house on Romsey Ave in Sunshine North, where the pair lived together.

The property is taped off and a large pool of what appears to be blood can be seen outside the front door.

"It is a graphic crime scene and it will take some time and forensics will be on scene for the next three or four hours," Insp Hughes said.

"We know this poor woman has died as the result of a gunshot wound but what we don't know at this stage is how that occurred."

Det Insp Hughes said the man and woman were known to police.

"That male person is currently in police custody. We're actually letting him sleep. We'll conduct a post-mortem today," he said.

Police are appealing for anyone with dash camera footage of the car crashes to come forward.