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MEMPHIS, Tenn. — Prosecutors say DNA testing helped convict a Tennessee man for raping a woman in her apartment more than nine years ago.

The Shelby County district attorney’s office in Memphis said in a news release that 44-year-old Carlos Wilson was found guilty Wednesday of rape and aggravated burglary.

Witnesses said during the trial that Wilson broke into an apartment in January 2010 and raped a 21-year-old woman who was in bed with her 3-year-old son. Wilson allegedly threatened to kill the woman or the child if she screamed or told police.

Wilson is already serving a 21-year prison sentence for the sexual battery and exploitation of a child in 2011. DNA obtained when Wilson was arrested in that case linked him to the woman’s rape.