It happened on the 1400 block of Roosevelt Avenue around 1 p.m.
Detectives say 38-year-old Jose Calvario and his brother-in-law live in the same apartment and they got into an argument last night.
Neighbors say they see things like this more than they should.
"It was actually a little bit scary but I think people now get used tot his. My grandma, she's been here for 20-something year and it still scares her, it's alarming," said Giovanna Sierra, whose mother lives nearby.
Officers identified the suspect as 26-year-old Esteban Reyes. Detectives arrested him when he returned to the scene during the investigation.