Do you know of any killers who appeared on TV prior to committing their crime (or, prior to being found out)?

I know of these:

-Ralf Panitz (Jerry Springer show)

-Rodney Alcala (Dating Game)

-Jonathan Schmitz (Jenny Jones show, although the show didn't air)

-Ryan Jenkins (Megan Wants a Millionaire)

NOT professional actors, please, just regular people.

Mainly interested in murderers, however if you know of an especially bizarre, brutal or shocking crime committed by such an individual, feel free to mention it.

Thank you!