Prison officials post photo of a smiling O.J. Simpson

In the Nevada state correctional system, he is known simply as prisoner 1027820.

To the rest of the world, he is of course O.J. Simpson, the NFL legend who was convicted in 2008 for his role in an armed robbery and kidnapping, and sentenced to up to 33 years in prison.

Photographs of Simpson in the Lovelock Correctional Center are rare verging on nonexistent. But this week, the state released a new mugshot of the former football star, his first in three years.

The new mugshot, which a prison spokeswoman said was taken in mid-May, shows a visibly aged Simpson -- he turns 69 next month -- wearing a green button-down shirt. His hair noticeably gray, Simpson is shown smiling against a red background.

Simpson is being held in medium-level security at Lovelock, located in Pershing County. He is eligible for parole next year.

In 2013, Simpson was granted parole on some of his charges but remained in prison due to other convictions for which he was not eligible for parole at that time.

Simpson was acquitted in 1995 of the murders of his ex-wife Nicole and her friend Ronald Goldman. The high-profile criminal case was recently made into a series on FX, “The People v. O. J. Simpson: American Crime Story,� with Cuba Gooding Jr. as Simpson.

A new five-part documentary on Simpson, “OJ: Made in America,� is set to begin airing on Saturday 9 p.m. ET/PT on ABC. The documentary will pick up on ESPN from June 14-18. The documentary premiered earlier this year at the Sundance Film Festival.

MORE O.J. SIMPSON NEWS:

Why ‘O.J.: Made in America’ might be the first television show to win an Oscar

Knife linked to former O.J. Simpson property is not connected to homicide case, LAPD concludes

The essential ‘The People v. O.J. Simpson’ FAQ: Inside the L.A. Times Archive

Robert Kardashian: Keeping up with the man who stood by O.J. Simpson

‘The People v. OJ Simpson’: Cuba Gooding Jr. says ‘there’s so much that trial shed a light on’