Investigators seeking tattoo artists used by Aaron Hernandez for info on murders

The Suffolk district attorney's office, which is mounting a case against former New England Patriots tight end Aaron Hernandez in the case of a double murder in 2012, is asking for help from tattoo artists who might
have inked Hernandez.
It appears that tattoos on Hernandez' body could contain evidence that pertains to the case. Hernandez, who currently behind bars for the 2013 murder of Odin Lloyd, has been indicted in the 2012 shooting deaths of Daniel de Abreu and Safiro Furtado.
The tattoo artists are not suspects in the case but could provide evidence against Hernandez and "may have made observations of evidentiary value."
According to USA Today, investigators are hoping to speak with tattoo artists who did work on Hernandez's right arm  although they won't say what possible clues the ink contain — between a time period of February 2012 and June 2013. Hernandez is known to have traveled to California, Connecticut, Florida, Massachusetts and Rhode Island in that time period where the tattoos might have been inked.
Hernandez is slated to be arraigned May 28 on two counts of murder for allegedly shooting de Abreu and Furtado in Boston in 2012, according to prosecutors. It's not clear if there's a connection between those shootings and the Lloyd death, whose body was found near Hernandez's home a year later.
Hernandez is expected to appear at next week's arraignment