Susan Powell, Missing Mom Update: Billboard Rises Near Parents' Home

PUYALLUP,  Wash. (CBS/KIRO) A billboard of Susan Cox Powell, who disappeared from West Valley City, Utah six months ago, rises over travelers alongside Route 161 in Washington State.

PICTURES: Missing Utah Mother Susan Powell 

Chuck and Judy Cox, parents of the missing mother of two, wanted the billboard placed near their home in Puyallup, Wash., to keep their daughter's case on everyone's mind, according to the Deseret News.

PICTURES: Missing Utah Mother Susan Powell 

"The purpose of the billboard is to remind the public that Susan is still missing. We continue to look for her, and we are asking for the public's help with that," Chuck Cox told the Deseret News.  According to the Utah paper, the picture on the billboard was taken by Susan's father, and another one like it is planned to go up next week in the Salt Lake City area.

Powell mysteriously disappeared on Dec. 7, 2009, when she did not report to her stockbroker job and her two sons, ages 2 and 4 did not make it to day care. Police investigated the family's residence in West Valley City only to find it empty, except for two fans directed towards a wet spot on the rug. Josh Powell, Susan's husband, told police he had taken their sons camping at approximately 12:30 a.m. and returned that evening.

He has been repeatedly questioned in the case and was named a "person of interest" by police, but no charges have been filed.

Complete coverage of the Susan Powell case on Crimesider.