NOW HILL, Md. (AP) — A Nigerian man died in federal immigration custody over the weekend, days after he was convicted of a sex offense and assault in Maryland.

Anthony Oluseye Akinyemi, 56, died Dec. 21 after being found unresponsive in his cell at the Worcester County Jail in Snow Hill, Maryland, according to a news release from U.S. Immigration and Customs Enforcement.

The official cause of death was not immediately determined, but authorities believe Akinyemi killed himself.

Akinyemi had been charged with sexual abuse of a minor and was convicted last week in Baltimore City Circuit Court.

Officials said he entered the U.S. lawfully on a non-immigrant visa in 2017 but did not comply with the terms of his admission.

He had been in ICE custody for less than 24 hours, authorities said.