Democratic Rep. Scott Guthrie of Coventry filed a cyber-harassment complaint with police regarding the page, which appeared to belong to Guthrie but slammed him as a "slimy, bottom-dwelling parasitic creature."
"I believe several laws were violated," Guthrie told NBC 10. "Someone impersonated a state representative. Where does this end?"
Police determined that the page was created at the State House by Republican Sen. Nicholas Kettle, also of Coventry.
The 23-year-old Kettle told The Providence Journal that he wanted to criticize Guthrie over a local fire district controversy. Kettle says he won't apologize for Coventry's "rough and tumble politics."
The website was taken down Wednesday.
The Journal reports that a staffer who helped Kettle create the site has lost his job.
Guthrie said he's going to pursue the complaint to the fullest extent of the law.
Police say they have no plan to file charges.
NBC 10 contributed to this report.