He resigned as sheriff in September 2007, after having pleaded guilty to federal tax evasion and mail fraud.

[5][6] His father, Kenneth C. Jenne Sr., was employed by a utility company, and his mother worked for the Palm Beach County Clerk of the Court.

In 1968, he earned his Bachelor of Arts in political science from Florida Atlantic University in Boca Raton, where he served as student body president.

In January 1998, Florida Governor Lawton Chiles, a fellow Democrat, selected him to become Broward County sheriff to succeed the late Ron Cochran.

Under his direction, the organization was responsible for law enforcement and fire rescue duties in 14 cities and towns, as well as all unincorporated areas of Broward County.

By September 2008, he was moved back to FDC Miami, as he was a possible witness in a civil case against the Broward Sheriff's Office (BSO) involving a jail beating.