Police are searching for a man after a woman's body was discovered at a home in Bellambi, north of Wollongong.

Kristie Powell, 39, was found dead about 1:10am by a friend who then called emergency services to the Lorking Street home.

Detectives said her five-month-old son was found unharmed in his bedroom at the house.

Police said Ms Powell had suffered "serious injuries" and they are treating the death as suspicious.

A crime scene has been set up and the property is being forensically examined.

Detective Inspector Brad Ainsworth said Ms Powell was covered in a significant amount of blood and there could have been a weapon involved.

The home in Bellambi is being forensically examined. ( ABC News )

The woman's body was found in her bedroom, he said.

"We're treating it as a homicide," Detective Inspector Ainsworth said.

The boy is being looked after by his grandparents.

Stalker 'obsessed' with victim

Six months ago, Ms Powell warned friends on Facebook that she wouldn't answer calls from private numbers because she had a stalker.

A chilling post that elaborated on the situation revealed Ms Powell had a short-term employee some two years ago who became "obsessed" with her.

"He is mentally unwell and I have contacted the police about him on a few occasions but there is nothing that they can really do as he is considered non-threatening," she wrote.

Kristie Powell's five-month-old son was found unharmed in his bedroom. ( Supplied )

Ms Powell said she had received messages saying "die Kristie die" but the ex-employee did not approach her or her property.

She said she sometimes received more than 100 calls or messages each day.

"He calls himself the Reaper and thinks that he is way more important than he is," she said.

"Most of the time it is highly amusing and entertaining really. He needs serious help but the mental health system just keep releasing him."

When asked about the stalker, Detective Inspector Ainsworth replied: "Obviously Facebook reviews will form part of our investigation".

Police are also carrying our door-to-door enquiries and hope to collect CCTV footage from residents and businesses.

They are unsure whether the victim knew the attacker.

Detective Inspector Brad Ainsworth said Ms Powell was found in her bedroom. ( ABC News: Justin Huntsdale )

Neighbours have described their shock at the dramatic scenes unfolding in the quiet street this morning.

"It's terrible. She was such a nice woman, kept to herself, but was pleasant," said one man who lives across the road.

Another man, who was walking his dog this morning, said he couldn't believe it when he turned on the news.

"This area is really quiet — people just keep to themselves — but to hear that a mother was killed and her baby survived, well that's just awful," he said.