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A 53-year-old man arrested after he allegedly sexually assaulted a 13-year-old child repeatedly had mummified remains in a closet in his home in Newark, New Jersey, police said Monday.

Robert Frank Williams (Essex County Prosecutor’s Office)

Investigators also found an alter to an unknown deity in Robert Frank Williams’ bedroom, officials said. They found the remains and altar when they executed a search warrant Thursday in connection to the sexual assaults.

Williams allegedly sexually assaulted a minor over a period of several months, beginning in 2018, according to KTLA sister station WPIX in New York City.

He’s charged with: first-degree aggravated sexual assault for engaging in an act of penetration upon on a child younger than 13 years of age; first-degree endangering the welfare of a child for the production of items depicting the sexual exploitation or abuse of a child; second-degree sexual assault upon a victim who was between the ages of 13 and 15; second-degree luring, third-degree endangering the welfare of a child for engaging in sexual conduct with a child; and second degree desecration of human remains.

Authorities have not yet identified the remains.