A 14th suspect in the brutal slaying of Bronx teen Lesandro “Junior” Guzman-Feliz is still at large, it was revealed in court Monday.

The development surfaced at the arraignment for a 13th defendant, Ronald Urena, who was arrested Sunday night for his alleged involvement in the horrific caught-on-video bodega slaying by members of the Trinitarios gang. Junior, 15, was slashed and stabbed to death with machetes and knives in June in an apparent case of mistaken identity.

Bronx prosecutor Masateru Marubashi said parts of Urena’s indictment — on second-degree murder and conspiracy charges — were redacted “because one perpetrator is still at large.”

Urena — who appeared in khaki-colored jail clothes — pleaded not guilty in Spanish through a translator in Bronx Supreme Court and was held without bail.

NYPD Chief of Department Dermot Shea said separately at a press conference that Urena was a gang member who was in a car outside the bodega that night.

After court, Urena’s cousin told reporters he thinks cops arrested the wrong person.

“He’s not even apart of the group,” insisted the cousin, who didn’t give his name.

“They got him confused. Three days ago, they stopped him and said, ‘We are looking for a guy just like you,’ so they probably confused him.”

Urena is due back in court Oct. 25.

Additional reporting by Gina Daidone