Ophelia Ellis, who lived nearby, said she was shaken and saddened by the deaths. She told reporters the couple lived one unit away and that she often spoke with them.

“They were a very nice couple. No problems. Quiet. Went to work every day,” Ellis said.

Police found O’Neal, 59, and Brushwood, 57, inside their apartment near 55th Avenue and Washington Road. Ellis said she heard a loud bang near the top of the stairs and initially thought someone had shut a door. She later wondered whether it could have been the gunfire.

Kenosha police issued a public warning Tuesday describing Fleming as armed and dangerous. U.S. Marshals arrested the 33-year-old in Chicago late that night. He remained in custody in Cook County, Illinois, as of Wednesday.

Authorities in Seattle believe Fleming killed Graham Dobbeck, a former co-worker who worked as a gas station clerk, on Oct. 13. Washington charging documents allege Fleming entered the station, bought a drink, went behind the counter and shot Dobbeck multiple times.

Kenosha police have not filed charges in the deaths of O’Neal and Brushwood. The department said it planned to refer charges once the extradition process began. Because of an outstanding homicide warrant in Washington, Fleming was expected to be extradited to Seattle first.

Kenosha detectives traveled to Chicago to interview Fleming, but police said he declined to answer questions. According to court documents, Fleming’s twin brother told investigators he believed Fleming was behaving erratically and might be experiencing a mental health crisis. That account is an allegation reported to investigators, not a finding about the cause of the killings.

Crime-scene tape remained around the apartment building Wednesday. Ellis said the deaths were difficult to comprehend so close to home.