Robert L Diedrich age 90 of Twin Lakes, WI died June 4, 2025.  He was born in Johnsburg, IL on October 24, 1934.  The son of the late Edward Diedrich and Marcella (Hergott) Diedrich.  On June 16, 1956, at St. Killian Church he was united in marriage to Marilyn Rittman.

Robert loved racing sprint cars, collecting antique motorcycles especially Indian Motorcycles.  He was an avid snowmobiler, Green Bay Packer fan and liked to go golfing.  He owned numerous cars and owned an airplane.  He was the general manager of Sunnyside Chrysler, Dodge, Jeep, Ram in McHenry, IL for 47 years.

Survived by his wife Marilyn.  Father to Mark (Sharron) Diedrich, Bobbie (Don) Larie, Steve (Carol) Diedrich and Dave (Holly) Diedrich.  Grandfather to Brian (Amanda) Larie, Marcus (Kelly) Diedrich, Krystal May, Matt (Natalie) Diedrich, Ambry (Keith) Vepley and Amanda (Brad) Soltwisch.  Great grandfather to Chase, Chad, Charlie, Brey, Rhyker, Greya, Theo, Dominic and Audriana.  Brother to Nancy (John) Glowacki, Donna (Tony) Praza, Marlene (the late Larry) Stevens, Mariane (Spence) Mehalos, Carol (Mike) Kinnahan and Sister-in-Law Bonnie Mayer.  Preceded in death by his parents, Stepmother Frances Diedrich, his Brothers Daniel Diedrich, Richard (Sandra) Diedrich, Sister Betty Reynolds and Brother-in-law John Reynolds, Brother-in-law Larry Stevens and Sister Sandy Jung.

Visitation for Robert will be held on Sunday June 8, 2025, from 4:00PM until 8:00PM at the Haase-Lockwood & Associates Funeral Home 620 Legion Dr.  Twin Lakes, WI.  Private burial will be held at St. Joseph Cemetery in Richmond, IL.  The Haase-Lockwood & Associates Funeral Home of Twin Lakes, WI is honored to serve the Diedrich family.