Jack M. Siegel, a municipal lawyer who handled legal matters for several cities and towns, died of cancer in hospice last week. He was 88. Siegel joined Holland & Knight LLP in 2003, capping off a 63-year career with a legacy spanning the north and northwest suburbs. “He was considered by many as the dean of municipal law in Illinois,” said Steven M. Elrod, executive partner of Holland & Knight’s Chicago office. A graduate of the University of Chicago Law School, Siegel was admitted to the …