By Jeremy Ross

CHICAGO (CBS) — Five people are dead after being shot in the Dunning neighborhood Saturday evening, according to Chicago Police.

The victims were shot in an apartment complex in the 6700 block of West Irving Park Road around 5:30 p.m.

Investigators say a 67-year-old retired construction worker, who lived in the building for about 15 years, exited his apartment and walked into a neighbor’s apartment. He shot four people who were seated at a table eating dinner there, killing them all.

He then went upstairs to the third floor, entered another apartment and fatally shot a woman there, police say. That woman was in critical condition, according to police officials, but is now reported to have died late Saturday.

The victims, including three men and two women, are all adults in their 40s or older.

Investigators recovered the shooter’s handgun and are looking into how he got it. Residents told police the man had anger management issues, and neighbors had complained about his behavior in the past, but nothing like the violence seen inside the building Saturday night.

The prior behavior was not reported to police and involved incidents of noise disturbances, exchanging dirty looks and bumping into each other. Police say the attack appears to be targeted, but the motive is unclear.

Police say the 67-year-old is in custody and charges are pending.

Mayor Lori Lightfoot tweeted about the shooting Saturday night, calling it “devastating and almost unfathomable.”