CHICAGO, IL. (THECOUNT) — Krysztof Marek has been identified as the man charged in a mass shooting that killed five people at a Northwest Side condominium complex.

Marek, 66, has been charged with five felony counts of first degree murder, according to police.

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Marek, a retired construction worker who had lived in the building on the 6700 block of West Irving Park for 15 years, attacked his neighbors with a handgun around 5:30 p.m. Saturday.

Marek reportedly killed five of his neighbors as they ate dinner in a horror shooting Saturday evening at an apartment complex in Dunning, a community in Chicago, Illinois Northwest Side, according to police, reports WGN.

Officials say, the gunman, who also lives at the apartment complex in the 6700 block of West Irving Park Road, went into a neighbor’s apartment around 5:30 p.m., Saturday and fatally shot three men and a woman as they ate dinner, according to CPD First Deputy Supt. Anthony Riccio.

“For reasons we yet know don’t know, he opened fire on all four of those individuals, killing them all,” Riccio said.

All of the victims appeared to be in their 40s and knew the shooter, Riccio said.

“It definitely wasn’t random. He lives in the building, he’s lived there for 15 years. He knows all the victims, but he’s not talking,” Riccio said.

The gunman then went to the the building’s third floor, where he confronted another resident and shot her, Riccio said. She initially survived and was taken to a hospital in critical condition, but was later pronounced dead, police said.

Riccio said the shooter was a retired construction worker whose neighbors described him as having “anger management issues.” He had a history of complaints from other residents, including noise complaints and “exchanging dirty looks.”

Riccio said there was no forced entry to the apartments. A handgun was used in the shooting and police are looking into how the man obtained it, reports FOX32.

Police could be seen working at an apartment in the second floor of one of the buildings in the complex and had blocked off traffic in the area.

DEVELOPING::

Geo quick facts: Chicago, on Lake Michigan in Illinois, is among the largest cities in the U.S. Famed for its bold architecture, it has a skyline punctuated by skyscrapers such as the iconic John Hancock Center, 1,451-ft. Willis Tower (formerly the Sears Tower) and the neo-Gothic Tribune Tower. The city is also renowned for its museums, including the Art Institute of Chicago with its noted Impressionist and Post-Impressionist works – wikipedia.