The informant in this link says Gricar wasn't killed for the Sandusky investigation, but I am skeptical of his explanation. Sure seems like the Hell's Angels are much like MS-13; a strong arm of the cabal.
"According to the source, Gricar was murdered by a former Hell's Angel who was getting back at the DA for receiving a long prison sentence for an aggravated assault conviction in the 1990s. He also said speculation that Gricar's disappearance had something to do with the Jerry Sandusky scandal was 'especially annoying'.
The source took FBI agents to the location in Pennsylvania where he says Gricar's body was disposed of, but at the last minute wouldn't give the specific location since he wants to secure immunity first. The shaft where Gricar is buried contains the body of four others as well as guns and he doesn't want to incriminate himself or others by opening it up.
The source says Gricar's body was hidden there after his 'knee caps were spun' and his throat was slit."
dailymail.co.uk/news/article-2427951/Ray-Gricar-source-says-missing-DA-knee-caps-spun-throat-slit-Hells-Angel.html