One victim, who asked to remain anonymous, said he encountered the suspect on the night of Memorial Day in the 2800-block of North Francisco. He said a man in a dark hoodie charged at him with a machete and then stood over him as he fell.
"I felt wind from a machete swing on my face. He said, 'I'm going to chop you into pieces. I'm going to kill you. Give me your cash. Give me your wallet, or I'm going to kill you. Like, give me all your money,'" the victim recalled.
He said he didn't have his wallet and pleaded with his attacker, who patted him down, took his phone and then fled in a silver or gray sedan.
"It was nuts. It was scary," he said. "I thought I was going to die for sure."
In the most recent incident, a 52-year-old man walking on the sidewalk in the 3700-block of North Troy Street at about 9 p.m. Sunday night, police said.
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The victim's wife, who asked not to be identified, said her husband was on his way home and carrying a box of pizza when the suspect approached and demanded his property.
She said her husband first thought he could overpower the suspect, who he described as having a small build, until he saw the giant knife.
"It was very scary because he told me I think of my daughter because she's little," she said.
The suspect attempted to strike the victim with the machete, which caused the victim to fall to the ground, police said.
She said her husband ducked the suspect's swing and fell to the ground.
"When he fell, the guy dried again with the machete and he dropped the wallet because the guy said 'Gimme your money, gimme your money, gimme your money,'" she said.
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The victim then threw his wallet into the street to distract the suspect and ran from the scene, police said.
In the wallet was money her husband had been saving up to pay for his young daughter's birthday presents, but he still threw his wallet in the street and ran.
She also said the suspect may have had an accomplice, because he grabbed her husband's wallet and jumped into the passenger seat of a silver car, which sped off.
Police have not said if the robbery is related to other robberies involving a machete. Chicago Police Supt. David Brown said the common weapon is enough for police to believe they are likely related.
"We're expending all of our resources to capture this person as soon as possible. Obviously, we're concerned like every resident is that this violent person is using a weapon like a machete," Brown said.
The other robberies occurred in the:
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-3000-block of North Christiana Ave. on May 27 at 7:58 p.m.
-3200-block of North Monticello Ave. on May 30 at 11:45 p.m.
-4100-block of West Fletcher St. between May 30 at 11:45 p.m. and May 31 at 12:10 a.m.
-3300-block of North Monticello Ave. on June 3 at 9 p.m.
-4000-block of West Eddy St. on June 3 between 9 p.m. and 9:15 p.m.
Brown said CPD is adding more resources to patrol the areas where the robberies happened. So far, no one is in custody.