UPDATE: Letter May Reveal What Happened to Baby Kate

Wednesday UPDATE: New details in the case of missing Ludington baby Katherine Phillips. Sean Phillips reportedly wrote a letter to Ariel Courtland, baby Kate's mother, that the child is dead.

Ionia County officials say Ariel Courtland will get a license tomorrow to marry Sean Phillips.

Phillips is in prison in Ionia County serving a 10 year sentence for the disappearance of 4-month-old Kate.

The baby's mother, Ariel, told WOOD-TV in Grand Rapids she wants to marry Sean Phillips to learn what exactly happened to baby Kate, last seen in June of 2011.

The couple has one other child, Haley, who is 4-years-old.

Police and FBI consider the baby Kate case a murder investigation.

We are working to bring you more on this story including reaction from the community tonight at 6:00.