MADISON, WI (WTAQ) - A Fox Valley man who disappeared in Madison a week ago might have fallen into open water on Lake Monona.

That’s according to Madison Police, who have been searching for 26-year-old Charles Guerts of Kaukauna.

He was in Madison for a business conference when he was last seen leaving the Sheraton Hotel early last Wednesday.

Officials said a police dog found Guerts’ scent where a man who was believed to be Guerts knocked on a home’s patio door about a half-hour after he left the hotel. Dane County sheriff’s personnel then searched the nearby Lake Monona. But they could not find any indications that he fell into the water.

A police search was suspended during the weekend – but officers plan to resume it once the weather gets a little warmer.