Should I include this brief stint as an office manager on my resume, or leave it off?

I was an office manager at our local Edward Jones office for a bit. The guy who hired me, Ken, came in under a mentoring program. The main financial adviser, Roger, who has been here about 20 years, gave Ken his own space at the back of the building.
Ken hired me to be his office manager in March of 2009. Two months later in May of 2009 Ken left the company (he got his happy ass fired, actually >_<) and this negated my position.

As far as admin assistants go, it was a pretty prestigious and sensitive position. That is a big plus. On the down side, I was only there for 2 months. Sometimes I leave it on my resume and note that Ken left, which negated my position. However, if they don’t get that far it could leave them with any number of bad impressions.

So, leave it on or leave it off?

Here’s my work history:

2010 – 2013 Teacher at an adult high school diploma program (closed due to budget cuts. Thanks Brownback.)

2009 Office manager (for two months.)

2002–2007 Sole proprietor (got out of the business before they had to commit me!)

1998–2002, Customer Service Specialist with CellularOne (sold to US Cellular which negated my position.)