A Concord woman was arrested last week and charged with killing her boyfriend in November, police said.

Police responded to the 3600 block of Wren Avenue on Nov. 25 on reports that man there had stopped breathing.

Officers and firefighters attempted to save the man's life, identified as 47-year-old Danny Ray Bennett, but were unsuccessful.

Bennett's long-term girlfriend, identified by police as 41-year-old Dava Alizabeth-Ann Steen, told police that Bennett had a history of health problems, and police ruled the death was from natural causes.

But on Jan. 17, a witness contacted police and claimed that Steen had suffocated and killed Bennett during a fight. Police said they obtained additional evidence corroborating that story.

On Jan. 20, detectives arrested Steen and searched her home, collecting additional evidence, police said.

Police said murder charges against Steen were filed by the Contra Costa County District Attorney's office and she was due in court to enter a plea on Feb. 2.