[Jackie]

Maybe someone who knew about the case got tired of listening to Ritter's spew on all the networks?

Homeland Security probably got suspicious of Ritter's weird behavior and launched an investigation into drug use, maybe, and uncovered the internet dalliances.

[Amelia]

Homeland Security probably got suspicious of Ritter's weird behavior

This seems to have happened in June 2001 - predates Homeland Security, I think.