Police searching for the suspected Latvian killer of a 14-year-old London girl say they have found a body in a park believed to be his.

Metropolitan Police sealed off entrances to Boston Manor Park after discovering the apparent body of 41-year-old Arnis Zalkalns. They expressed confidence that pathologists would confirm his identity.

The discovery may conclude one of the biggest police operations in London history. More than 800 officers spent weeks searching canals and fields for Alice Gross following her Aug. 28 disappearance. Her body was found in the River Brent on Sept. 30.

British authorities have faced heavy criticism for failing to identify Zalkalns as a suspect sooner. He served seven years in a Latvian prison for murdering his wife, and police feared he had fled back to Latvia.