Sean Phillips, a 23-year-old Michigan father, has been officially charged with the murder of his baby daughter, two years after "Baby Kate" disappeared.

An open murder charge was filed Friday against Phillips. Katherine "Baby Kate" Phillips was last seen on June 29, 2011, at the age of four months.

Baby Kate remains missing to this day.

The infant’s disappearance riveted western Michigan after Phillips allegedly took off with the girl following an argument with her mother, Ariel Courtland.

Phillips was arrested the next day at his parents’ house, but there was no evidence of Baby Kate. Now "new evidence" has been found to support the charge.

Michigan Attorney General Bill Schuette declined to state what that is.

Volunteers scoured wooded areas of Michigan’s northern Mason County earlier this summer, the area where Phillips allegedly dumped Baby Kate.

Sean Phillips allegedly left Baby Kate in a "peaceful place" according to a letter authorities say he wrote to Ariel Courtland from prison last year.

He also claimed at one point that he accidentally killed the baby after violently yanking her infant seat out of his car when he was angry at Courtland.

Phillips was convicted in 2012 of unlawful imprisonment in his young daughter’s disappearance, and was already serving 10-15 years in state prison.

Open murder is punishable by up to life in prison.

"This is a tragic case. It just makes you sick," Schuette said. "There will be no first birthday party for Baby Kate. No first day of kindergarten. No first Christmas."

Phillips’ probable-cause hearing is set for October 16.

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