I thought I would start a thread on this young guy as I came across an article on the case which has a sketch that neither NAMUS or Doe Network has and some more in-depth details that either of those sites have which someone might be able to link to something, for example they have narrowed it down to a man in his 20s and included initials which might be of interest.
NAMUS link -
https://identifyus.org/en/cases/2410
The Doe Network:
http://www.doenetwork.org/hot/hotcase531.html
Hot Case 531
Unidentified White/Hispanic Male
The victim was discovered on January 17, 1980 in Sacramento, Sacramento County, California
Estimated Date of Death: January 17, 1980
Cause of Death: Gunshot wound to the head
Vital Statistics
Estimated age: 16-25 years old
Approximate Height and Weight: 5'7"-5'9" (69"); 147 lbs.
Distinguishing Characteristics: Brown hair; Brown eyes. Brown mustache and reddish-brown goatee.
Marks, Scars: Three scars on lower right abdomen, distinctive scar on left hand fingers, large freckles on the shoulders and upper back.
Clothing: Blue quilted jacket; dark blue pullover sweater; blue "Levis"; white, JC-Penney t-shirt; blue Levi's, white shorts; ; white socks; blue jogging shoes. No jewelry.
Personal Effects : "Salem" cigarettes
Fingerprints: Available
Dentals: Available
DNA: Available
Case History
The victim was located on a set of bleachers at Southside Park sports field in Sacramento, California on January 17, 1980.
Some extra info from this article published today -
http://www.modbee.com/2012/02/26/2086147/sacramento-police-hope-for-new.html
Sketches -
Some more detailed info from today's article -