Former Ramsey County Sheriff Bob Fletcher, an open critic of the current sheriff, cryptically announced Friday that he will host an event next week on the last day to file for election to his old post.

Fletcher declined to say whether he would announce a run for the sheriff's office, which is up for election this year, at the event.

"We will have an announcement on Tuesday, and an event Tuesday night, but at this time, we are not confirming any particular details," he said. "I'll certainly have a lengthy agenda to articulate Tuesday, possibly Monday."

Fletcher served as Ramsey County sheriff for 16 years until losing re-election in 2010 to Matt Bostrom. Fletcher has been critical of Sheriff Jack Serier, who replaced Bostrom last year after Bostrom's early retirement.

Fletcher previously announced that he won't run for re-election to his post as mayor of Vadnais Heights but has remained tight-lipped about his future. "It will certainly be regarding the election season," he said of the event.

It is scheduled for 5:30 to 7:30 p.m. at Mancini's Char House.

"Please Join Us as we Kick-Off our next mission!" said a posting on Fletcher's Facebook page that featured a photo of him wearing the blue uniform of another previous employer, the St. Paul Police Department.

Last month, Fletcher filed a complaint with St. Paul police about Serier's residency, claiming that he was living in Stillwater instead of Ramsey County when the Ramsey County Board appointed him to replace Bostrom. The complaint was referred to the Minnesota Bureau of Criminal Apprehension because Serier is a police employee on leave for the sheriff's post.

Serier has maintained that he never violated the residency requirement. The BCA could not be reached for comment late Friday about the status of the complaint.

Fletcher has not filed official candidacy paperwork or campaign finance reports for the sheriff's race.

Serier, who is endorsed by the DFL Party, is running for sheriff against law enforcement veteran Mike Martin. Martin is assistant director of emergency management for the University of Minnesota and was a Minneapolis police officer for 23 years.