Alan L. O'Neill is accused of marrying a woman in 2001, then marrying another woman 10 years later. During those years, he changed his name from Alan Leighton Fulk to Alan Leighton O'Neill, according to the statement of probable cause.
O'Neill, 41, moved out of his first wife's home in 2009, but never filed for divorce or legal separation, investigators said.
Officials learned of the case in 2010 when O'Neill's first wife learned of his second marriage and called O'Neill's mother.
When confronted by his second wife, O'Neill admitted he was still married to another woman. He told her not to tell anyone about his marital status, which he promised to fix.
"Most of us find that one spouse is enough work and joy. I'm not sure why someone would want two," said Pierce County Prosecutor Mark Lindquist. "I can't help but think Valentine's Day must have been real stressful with two wives."
O'Neill is scheduled to be arraigned next week. If convicted, he could face up to a year in jail.