A 27-year-old man has been charged with murder and arson after a woman was found dead in a unit fire in Canberra's north earlier this year.

Emergency services were called to Wallcliffe Flats on Osborne Place in Belconnen about 6:40am on May 18, with crews finding a ground-floor unit alight.

Kylee McHugh, 46, was found inside but could not be saved.

On Monday, police arrested a 27-year-old man who is due to face the ACT Magistrates Court today.

ACT Policing's Detective Acting Inspector Chris Watson said the accused was known to Ms McHugh, describing it as an "association" rather than a "relationship of any kind".

"We believe that in the early hours of the 18th of May he did murder Kylee and subsequently set the house on fire,"he said.

Detective Acting Inspector Watson said he could not speak on a possible motive, but confirmed that the accused was known to police.

He said the man was known to "transit the area" where Ms McHugh was killed, and police were investigating whether drugs could have been involved.

Detective Acting Inspector Watson did not say how Ms McHugh died.

He encouraged anyone with further information to contact Crime Stoppers.

"At this point in time [the 27-year-old] is the only suspect but we do believe there are other people that have more information and that can assist us," he said.

"They may have information that isn't known to us and may be able to provide further insight into events that happened after her death."