SEYMOUR, Conn. -- Janice Smolinski said she’s been waiting nearly four years for her son to come home.

"We didn't give up, and we're not going to give up," she said. "We going to continue until we get our answers."

William Smolinski had asked a friend to walk his dog, but never dropped off the keys to his house. The 31-year-old construction worker from Waterbury disappeared without telling anyone where he was going.

"'No body, no case' is what we were told in the beginning, and that isn't so," Janice said. "You evaluate every situation."

For the past four days, police have been digging at a home on Bungay Road in Seymour based on leads they have obtained.

Last summer, acting on another tip, police dug up a driveway outside a home in Shelton. Nothing was found there, they said.