SALEM, Ore. (AP) -- The Oregon Court of Appeals ruled that a Klamath Falls man must be retried on accusations he tried to throw a Valentine's Day sex-and-suicide party in 2005.

The court said Gerald Krein, 30, gave a verbal statement forgoing a jury trial in 2006, but did not sign a written waiver as required.

Authorities charged Krein with solicitation to commit murder and solicitation to commit manslaughter after learning that he used a Yahoo instant messenger account titled "suicideparty2005" to tell women of a party that was supposed to end in a mass suicide.

Krein was arrested after a Canadian woman alerted authorities out of fear that children would be involved. Krein was arrested five days before Valentine's Day, and none of the women who made the alleged pact showed up at his home on the scheduled day.

A Klamath County judge later sentenced Krein to up to 20 years in the custody of the Oregon Psychiatric Security Review Board. Krein was transferred last week from the state mental hospital to the Klamath County Jail.