A 69-year-old Calgary man is facing more than a dozen sexual assault charges in connection with incidents that allegedly happened over a five-year period.

The police investigation began in December of last year when a 17-year-old boy claimed he'd been sexually abused between October of 2007 and June of 2009.

After that, two more potential victims were identified. Both are boys, one is 10, the other is 14.

All three boys say they met the man through mutual acquaintances.

Arnold James Somers, a former RCMP officer who goes by the name of Jim Somers, is scheduled to make his first court appearance Wednesday.

"This is not an instance where Mr. Somers was a teacher or a coach or anything like that," acting Staff Sgt. Ryan Jepson told CBC News Tuesday. 

CBC News has also learned that Somers was convicted in the 1990s, in a case heard in Saskatchewan, of sexually assaulting three Yorkton-area brothers in the 1980s. He was sentenced to two years less a day.

The new charges relate to incidents that allegedly occurred at various locations in and around Calgary.