Q: Context: Rock Star is a 2001 American musical comedy-drama film directed by Stephen Herek and starring Mark Wahlberg and Jennifer Aniston. It tells the story of Chris "Izzy" Cole, a tribute band singer whose ascendance to the position of lead vocalist of his favourite band, which was inspired by the real-life story of Tim "Ripper" Owens, singer in a Judas Priest tribute band who was chosen to replace singer Rob Halford when he left the band.

Question: who is the movie rock star based on? Let's give stream of consciousness first:
The relevant information to answer the above question is: It tells the story of Chris "Izzy" Cole, a tribute band singer whose ascendance to the position of lead vocalist of his favourite band, which was inspired by the real-life story of Tim "Ripper" Owens, singer in a Judas Priest tribute band who was chosen to replace singer Rob Halford when he left the band. Therefore, the final answer is Tim '' Ripper '' Owens.