Update: The Milwaukee Journal Sentinel has more on the arrest of Lee Erickson, as does TMJ4 and WISN.
Fox 6 has the disturbing details, which reportedly include the arrest of the Milwaukee Symphony Orchestra chorus director, a South Milwaukee resident.
From the story:
In a statement, Sheriff’s officials say the Sheriff’s Office has received numerous complaints of sexual activity and solicitation taking place in County parks.
In response to these complaints, Sheriff Clarke initiated an undercover operation with a goal of curbing and deterring illegal sexual activity in the parks, and seven arrests have been made in the past two weeks.
Four more arrests were made Tuesday, November 5th.
Those arrested range in age from 43 to 75.
58-year-old Erickson of South Milwaukee was arrested on Monday by an undercover Sheriff’s deputy.
According to Sheriff’s officials, Erickson followed the deputy into a bathroom at Grant Park along Milwaukee’s Lakefront, exposed himself, and began masturbating in front of the officer.
Sheriff’s officials say Erickson stated numerous times that he just wanted to be able to pay the fine and not have this go public or this would ruin his career.
I’ll keep you posted.
South Milwaukee Blog 
Did Erickson have contact with students at St. Anthony’s school? JS reports he was music director for the church, but no mention of the school.