Detective Marty Compton of the Parma Police Department said the 48-year-old Garfield Heights man was arguing on New Year's Eve with Ronald Deaver, 31, after Deaver discovered the man did not know the music stars were married, WJW-TV, Cleveland, reported Thursday.
Compton said Deaver stabbed the man at about 11 p.m. outside Deaver's apartment.
The victim was reported to be in good condition at MetroHealth Medical Center.
Deaver was arrested and charged with felonious assault. Jennifer Fornari, 31, was arrested on a charge of obstructing justice after allegedly telling officers Deaver no longer lived in his apartment.
Senate Democrats to pull all-nighter on climate change
Susan Sarandon 'very excited' about daughter's pregnancy