The Boston Police Department and Suffolk County prosecutors are seeking the assistance of tattoo artists who may have inked Aaron Hernandez after the 2012 South End double homicides of Daniel de Abreu and Safiro Furtado.

According to the Suffolk County District Attorney’s office:

Investigators hope to speak with the artist or artists who provided Hernandez with specific tattoos on his right forearm between February 2012 and June 2013. Hernandez is known to have traveled to Hermosa Beach, California; Bristol, Connecticut; Palm Beach and Miami, Florida; Boston, Massachusetts; and Rhode Island in that time period, but investigators are open to speaking with anyone who tattooed Hernandez' right forearm during that time.

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Authorities are not publicly describing the tattoos and said the artists are not accused of wrongdoing, but are considered witnesses who “may have made observations of evidentiary value in the pending Suffolk County murder prosecutions.”

In this video from WBZ, Hernandez talked about some of his tattoos.

Hernandez was indicted on two counts of first-degree murder last week in the July 16, 2012 slayings. He was also indicted on three counts of armed assault with intent to murder and one count of assault and battery by means of a dangerous weapon.

Hernandez already faces a first-degree murder charge in the June 2013 death of Odin Lloyd.

Suffolk District Attorney Daniel F. Conley last week said Abreu and Furtado were “stalked, ambushed, and senselessly murdered on the streets of the city they called home” after a “chance encounter” with Hernandez and another individual at Cure Lounge in the Theatre District.

Prosecutors also announed today that Hernandez will be arraigned on those charges on May 28.

Hernandez’s cousin Tanya Singleton, who indicted last week on a criminal contempt of court charge, is expected to be arraigned on June 2.