Sanden, 55, insists he had no idea the victim, 48-year-old Rebecca Whitehead was dead when he last had sex with her.
But police say he tried to hide some video equipment when they arrived -- and after they watched what he had recorded, he was charged with necrophilia.
Whatever is on that tape also apparently caused a judge to raise his bond from $4,500 all the way up to $500,000.
Sanden has also been charge with charged with possession of marijuana and abuse of a corpse.
Sanden told police he met Whitehead on a telephone dating service, and that the two had been living together for about three and a half months, according to the Washington Times-Herald.