He is forgotten no more. An NYPD detective who was killed during a cigar store hold-up a century ago will finally receive the recognition he deserves Monday – when a headstone inscribed with his name and acknowledging his service is placed on the unmarked grave where he was buried.

The honor is thanks to a retired NYPD lieutenant who learned of the travesty while researching a loved one’s family tree. Bill Markowski was studying his fiancee’s family history on an online ancestry research site when he discovered that her great-great uncle, Bernardino Grottano, better known as Barney, was buried in famed Green-Wood Cemetery in Brooklyn.