LUDINGTON, Mich. -

A jury has convicted a West Michigan father of unlawful imprisonment in the disappearance of his baby daughter.

The Mason County Circuit Court jury in Ludington on Friday returned the verdict against Sean Phillips on the charge, also known as secret confinement. Deliberations began Thursday in the case following a nearly two-week trial.

Phillips faces up to 15 years in prison when sentenced.

Katherine Phillips was 4 1/2 months old when she last was seen June 29, 2011. She lived with her mother Ariel Courtland in Ludington, about 80 miles northwest of Grand Rapids.

Extensive searches haven't found the girl. Phillips' lawyer has said he'd been cooperative with police.