A Ukiah man who disappeared Wednesday after taking the body of his 5-month-old son to a hospital remained missing on Monday.

Police still are looking for Casimir George Janusz, 36, of Ukiah, but have ended their massive search in the hills west of Hopland, said Ukiah Police Capt. Trent Taylor.

The three-day search was exhaustive, he said.

Janusz' vehicle was found abandoned at his family's Hopland ranch property soon after after he took his son to Ukiah Valley Medical Center, authorities said. He left the hospital and vanished after it was confirmed the boy was dead, police said.

The cause of the child's death has not yet been determined, Taylor said.

Police ask that anyone with information about Janusz contact the department at 463-6262.