Volunteers will join friends and relatives on Sunday in an organized search for a missing Gurnee man.
Andrew Adler, 57, left his home Sunday morning for a bike ride, and he hasn't been seen or heard from since, Gurnee police said.
"We don't have any leads on this," police Cmdr. Willie Meyer said Friday. "The family is obviously feeling that they need to do something."
Adler, who works in medical research, has never disappeared before, said friend and former neighbor Dan Deuel of Gurnee.
"It's just a mystery right now," Deuel said.
Adler enjoys riding on the Des Plaines River Trail through Lake County, Deuel said. He especially likes riding in areas he's never explored before.
Additionally, Adler is an avid swimmer, and his friends and relatives are concerned he may have gone into a local lake.
"But we just don't know," Deuel said. "We are in the dark."
Sunday's search will start at 1 p.m. at Joy Lutheran Church, 749 S. Hunt Club Road. It's expected to last until 5 p.m.
The search will focus on Lake County Forest Preserve District properties and bike trails.
Participants should wear insect repellent and protective clothes.
Adler told his family he was going for a long bike ride Sunday, which wasn't uncommon, police said. He reportedly was riding a blue Cannondale bike and wearing black shorts.
Adler is 5 feet 10 inches tall and he weighs 140 pounds, police said. He has brown and gray hair and blue eyes.
Missing persons fliers have been placed around the community. Additionally, a helicopter was used for a search Friday, Deuel said.
Anyone with information should call Gurnee police at (847) 599-7000.