Chicago police say they've charged an 18-year-old man with first-degree murder in the death of a 41-year-old man whose body was found decapitated inside an apartment on Christmas.

A Thursday police statement identified the suspect as Alexis Valdez of Chicago. Police didn't identify the victim. His body was found early Wednesday on the city's Northwest Side.

Authorities didn't provide other details, including the relationship between Valdez and the victim. Police have said that a knife was found at the scene.

There was no telephone listing for Valdez in Chicago.