A man believed to have killed his partner in an alleged murder-suicide was known to police due to a domestic violence incident earlier this year.

The bodies of the 47-year-old man and 41-year-old woman were located at a Bordertown property on Melvyn St in South Australia just after 11pm on Sunday during a welfare check.

South Australian Police said the pair were in a domestic relationship and had children together.

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They were living and working in the local community.

“Police believe the man took his own life after murdering the woman,” Acting Assistant Commissioner Cath Hilliard told reporters on Monday afternoon.

Hilliard added the man was known to police from a previous domestic violence incident earlier this year involving the woman.

Police are not looking for anyone else in relation to the deaths and have reassured the public that there is no risk to community safety.

The murder-suicide is believed to have occurred on Sunday, with no other individuals present in the house at the time.

A postmortem on the woman is scheduled for Tuesday and will determine the official cause of death, Hilliard said.

Neighbour Merrilyn Newman told 7NEWS she was shocked to learn of what had happened.

“I couldn’t believe it,” she said.

“It doesn’t happen very often.”

Newman said the couple had lived at the property for many years and were good people and good neighbours.

“When they cooked a lot of … bagels and things like that, they would bring it over to us (in) a package and put a couple of cans of coke in it.

“Because they like sharing with their friends and neighbours, so that’s the sort of people they were.”

She said the man once told her they were originally from Afghanistan.

He had arrived first, and his wife joined him later, though she didn’t speak much English.

The wife had moved from Adelaide to join him after their child started university.

Before she arrived, five people were living at the property — the man, his sister-in-law, her son, and another young couple.

Newman said she and the man would always wave to each other when they passed.

She would usually see them over the weekend hanging out their clothes, but not this weekend.

Anyone with any information is asked to contact Crime Stoppers.

If you or someone you know is impacted by sexual assault, domestic or family violence, call 1800RESPECT on 1800 737 732 or visit 1800RESPECT.org.au.

In an emergency, call 000.

If you need help in a crisis, call Lifeline on 13 11 14. For further information about depression contact beyondblue on 1300224636 or talk to your GP, local health professional or someone you trust.