Stars of the TV show "Sister Wives" say they have hired a prominent constitutional law professor to represent them in case they are charged with bigamy in Utah.

The family's marital status and living arrangements are under investigation by the Lehi police and the Utah County Attorney's Office.

The Salt Lake Tribune said Kody Brown and his wives -- Meri, Janelle, Christine and Robyn -- have hired Jonathan Turley, a member of George Washington University's faculty, to represent them if they are charged with bigamy, a third-degree felony punishable by as much as five years in prison.

Turley is a frequent guest on cable news television, providing analysis on constitutional and other legal issues.

The fundamentalist Mormons, who have 16 children, star on the TLC series "Sister Wives," which began its first season last month.