Elias Voorhees is the father of Jason Voorhees, and husband of Pamela Voorhees.  Little else is known about him as he did not appeared in any of the movies.

He made an appearance in the comic book "Friday the 13th: Pamela's Tale." He was seen as a gruff miner and abusive husband who treated Pamela horribly for any misdeed, real or imaginary.  He was eventually killed by Pamela with an axe and left to burn in their trailer once she'd set fire to it.