An illegal immigrant has been indicted in the “heinous” Jan. 6 killing and sexual assault of a 92-year-old “cat lady” in Queens, prosecutors announced.

Reeaz Khan, 21, was hit with seven charges in the Richmond Hill attack on Maria Fuentes, including second-degree murder, first-degree manslaughter, first-degree attempted rape, first-degree sexual abuse and tampering with physical evidence.

“The defendant is accused of pouncing on the 92-year-old woman from behind, throwing her to the ground and then sexually assaulting her before he ran from the scene,” Queens District Attorney Melinda Katz said in a statement.

“The victim was discovered hours later barely conscious, incoherent and naked from the waist down,” Katz said. “The defendant has been apprehended and will be prosecuted for his alleged heinous actions.”

The attack took place on Liberty Avenue and 127th Street in Richmond Hill, just a block from Fuentes’ home, prosecutors said.

He later claimed he found Fuentes passed out and tried to help her, but his pants fell down and his genitals came in contact with hers.

Khan is an illegal immigrant from Guyana who was free despite a deportation order from federal immigration officials for prior assault and weapons convictions.

Fuentas’ neighbors told The Post she was a noted cat lover who often fed local kitties and was known in the area as “cat lady.”

Khan is scheduled to return to court on Feb. 4.