TORONTO - The CBC-TV drama "Murdoch Mysteries" has yet another political cameo in store for its viewers.
The historical detective series was filming at the Ontario legislature on Friday.
The episode features a cameo by Ontario Lt.-Gov. David Onley, who plays the eighth Lieutenant Governor of Ontario, Sir Oliver Mowat.
Last summer, Prime Minister Stephen Harper made a cameo appearance as a clueless cop.
In Onley's episode, Det. William Murdoch is investigating the mysterious death of a member of the Ontario legislature.
Onley says he's excited to be part of the episode since he's a big fan of the show.
He says Queen's Park is the perfect location to film because it is a historical site.
The filming marks Onley's first acting gig in a very long time.
"I haven't acted since high school days," he said on Friday. "Now I don't have to have them put any grey in my hair. It's there naturally."
The show, which previously aired on Citytv, will air the fifth season on CBC-TV in September. Onley's episode is not expected to air until Season 6 debuts in January 2013.
"Murdoch Mysteries" stars Yannick Bisson as a detective who solves crimes in Toronto with forensic techniques that were radical at the turn-of-the-century.