Greater Manchester Police spoke to the 42-year-old in Failsworth on Saturday after an abandoned 999 call.
The woman had minor facial injuries and a 57-year-old man was arrested on suspicion of assault.
Police later returned to the property in Oldham Road to take a statement from the woman but found her dead.
A post-mortem examination found that the cause of death was "not suspicious", a Greater Manchester Police spokeswoman said.
A mandatory referral to the Independent Police Complaints Commission (IPCC) was made because police had been in touch with the woman prior to her death.
Det Ch Insp Howard Millington said: "First and foremost I would like to express our most sincere condolences to the woman's family for their tragic loss.
"In line with our usual policy when an incident such as this occurs, we have made referral to the IPCC and we await their decision on whether or not they wish to investigate."
He added: "In the meantime, we are continuing to investigating the circumstances surrounding the initial call that was made to police which prompted officers to attend and arrest a 57-year-old man on suspicion of assault."

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The Briton only needed one set to reach the last four, but beat the Swiss 6-4 6-2 to top the John McEnroe Group.
Murray extended his winning streak to 22 matches and goes on to face Milos Raonic at 14:00 GMT on Saturday.
Serb Novak Djokovic faces Japan's Kei Nishikori in the other semi at 20:00.
Djokovic also won all three of his group matches, and Murray must at least match his results at the O2 Arena to end the year at the top of the rankings.
In the last group match of the tournament, Croat Marin Cilic defeated Japan's world number five Nishikori 3-6 6-2 6-3.
Cilic's win means he will replace Frenchman Gael Monfils to become the new world number six.
Murray withstood an early barrage of winners from Wawrinka before taking a grip on the match midway through the first set.
"The first set was tight. There weren't many chances," said Murray, 29.
"I managed to get the break late in the set. In the second set I'd already qualified for the semis, so maybe it was easier for me to play more free than him."
The Scot knew he only required one set, while Wawrinka was really in need of a straight-set victory, lending the contest an added air of tension from even the early stages.
A healthy contingent of Swiss fans among the 16,000 spectators added to an atmosphere more akin to the latter stages of a Grand Slam.
Wawrinka, 31, blasted four winners in the opening game but could not make the breakthrough and Murray capitalised in game seven.
A loose backhand gave Murray a break point and when the Swiss failed to put away a forehand pass, the Wimbledon champion pounced at the net - prompting Wawrinka to smash his racquet in anger.
Murray could have been forgiven for a few nerves when three set points then slipped by on the Wawrinka serve, but he served out calmly in the following game and qualification was secure.
Wawrinka framed a forehand to drop serve at the start of the second and his challenge was all but over, as Murray raced 4-0 clear and closed it out after one hour and 26 minutes.
Murray's 22-match winning run equals the career-best effort he set earlier this year from Queen's Club in June to Cincinnati in August.
During that run he beat Raonic in the Queen's and Wimbledon finals, and he has since had another win over the Canadian in Cincinnati.
Raonic, seeded fourth, won two of his three group matches in London, only losing a tight two-set match against Djokovic.
"He's played very well in this event," said Murray, who has won his last eight in a row against Raonic. "These are quick conditions here and it'll be tough.
"He's got a huge serve. It's an amazing stadium and atmosphere."
A police force has referred itself to the watchdog over the death of a woman hours after she spoke to officers about an alleged assault.
[NEXT_CONCEPT]
Andy Murray qualified for the semi-finals and stayed on track to retain the world number one ranking with victory over Stan Wawrinka at the ATP World Tour Finals.