One woman has died and one man is in custody following an alleged assault near Bloor Street West and Spadina Avenue on Sunday, Toronto police say.

According to Const. David Hopkinson, police received a call around 2:40 p.m. of an assault in the area of Harbord Street and Brunswick Avenue.

Officers arrived to find a woman suffering from serious injuries.

The victim was taken to hospital, where she later died.

The man was arrested in the area of the incident and is now in custody, Hopkinson said.

Police are treating the death as "suspicious" and are currently on scene investigating, he added.

Incident took place inside boarding house, tenant says

Resident Krill Ilisky says it happened inside a boarding house, where he rents a room.

He says he was sleeping when he heard noises in his neighbour's room, who then came to him and alerted him to the incident.

"After that I went to his room and I found the lady covered in blood," Ilisky told CBC Toronto Sunday.

Krill Ilisky says the alleged assault took place inside a boarding house. He says he walked into the room of a nearby tenant to find the woman on the floor 'covered in blood.' (Chris Langenzarde/CBC)

"He was shaking, he was scared."

Ilisky says he then told his neighbour to call 911 immediately.