"I was shocked. I'm 84, so, you know, I'm nervous," said Robert Richmond.
Police were called to the Lincoln Perry senior home complex in the 3200-block of South Prairie Avenue about 3:40 p.m. after an on-scene witness said they couldn't get ahold of the woman, according to CPD.
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The victim was discovered unresponsive in a wheelchair and was pronounced dead at the scene, police said.
"I live close to her, and I can tell you she was engaging. She was someone who had been in the building for quite some time," said Michael O'Connor, a resident.
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Mae Brown's death has been ruled a homicide, and she appeared to have multiple injuries from an assault, the Cook County Medical Examiner's Office said.
"It is concerning because we have security, and they just got in. I mean how did they get in or what could happen to these people? They're all seniors, and some of them are vulnerable, some of them they can't even defend themselves. It's scary," said Irene Neira, a home care employee.
Her neighbors said she was a nice person.
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"It don't make sense. I just feel so horrible. I feel bad, sad. She didn't get a chance to enjoy the rest of her life. And for somebody to kill her and hurt her like that, they don't make sense to me," Dorothy Allison said.
No arrests had been made as of Monday morning. Anyone with information is asked to call police.