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No suspects had been arrested as of Tuesday afternoon.
Police officials say crime statistics back up the view that safety has deteriorated in the city's business center.
The research scientist at Medtronic was found hurt in July, died 26 days later.
Police officials say that the department has already started to implement many of the recommendations.
The 66-year-old suspect was arrested in St. Paul and booked into the Hennepin County jail on suspicion of murder, police said.
He meant to harm those in Public Works after losing his job, police say.
Family members identified the victim as 22-year-old Kacey Feiner.
Gov. Tim Walz decried the gunfire, which left 3 hurt, and fair officials said safety is their top priority.
The chaotic scene erupted around 10:20 p.m. outside the gate at Snelling Avenue and Midway Parkway as the fair was closing for the year.
The 23-year-old victim had lost several immediate family members to gun violence before he himself was gunned down on Saturday.