Notice of Gary's demise came from Penny Simon Erickson March 8, 2019. We don't have an obituary. The link above is for Gary F. Priester's Forest Lawn "find a grave" link. From there:
 
Gary F Priester
BIRTH    2 Jul 1952
DEATH    22 Jan 1982 (aged 29)
BURIAL    
Forest Lawn Memorial Park (Glendale)
Glendale, Los Angeles County, California, USA
PLOT    Comfort, Map E07, Lot 674, Space 2
MEMORIAL ID    85491633

https://www.findagrave.com/memorial/85491633/gary-f-priester