A convicted sex offender being placed by the state in a Birnamwood residence starting this weekend is rattling the nerves of neighbors, but Shawano County authorities say there is nothing they can do to stop it. The placement was ordered by a Milwaukee County judge, who approved a supervised release plan from the state Department of Health Services. Shermell G. Tabor, 41, was convicted in Waukesha County in 1995 of second degree sexual assault, according to the Wisconsin Department of Corrections Sex Offender Registry. According to the Wisconsin Circuit Court Access web site, the specific charge was aiding and abetting a second degree sexual assault. Tabor pleaded guilty to that charge and was sentenced to six years in prison.