The Vancouver Police Department is investigating the second homicide in less than 24 hours after a woman was found dead in an apartment on the city's west side on Tuesday night.

The death marks the ninth homicide of the year in Vancouver.

Patrol officers found the victim dead inside a residence around West 13th Avenue and Manitoba Street shortly after 10:30 p.m. after receiving a call "to check on her welfare."

Officers entered the suite after no one answered the door.

A man described only as "an associate of the person who lived at the residence" was detained a short time later by the Richmond RCMP, who contacted police in Vancouver. Police have not said how they were alerted to the man's presence.

An autopsy is scheduled to determine the woman's identity and how she died. Const. Lindsey Houghton said it appears she is in her 30s.

Meanwhile, a 21-year-old man with no criminal record has been identified as the person who was shot to death in Champlain Heights on Monday night.

Residents reported hearing a heated argument and multiple gunshots before the body of Harpeet Singh Sandhu was found lying beside an SUV.

Houghton said there is no evidence to indicate the homicide was gang-related. No suspects have been identified.

There is nothing to lead investigators to believe that the two murders are linked, Houghton said.

Anyone who knows anything about either incident is asked to call VPD Homicide detectives at 604-717-2500 or Crime Stoppers at 1-800-222-8477.

There were six homicides in Vancouver in 2010.