RICHMOND — The executive director of the Democratic Party of Virginia announced Wednesday that he is stepping down after a year on the job, continuing an election-year shakeup at the party.

Robert Dempsey said in email to party leaders that he will leave May 19 to “pursue a new career opportunity.” A successor is expected to be named in a matter of days.

Dempsey’s departure comes two months after Richmond Mayor Dwight Jones resigned as party chairman after just a year on the job. The leadership changes could give a jolt to Democrats as they try to wrest control of the narrowly divided state Senate from Republicans and make gains in the GOP-dominated House.