Former Republican Sen. Scott Brown won't be running in a Massachusetts special election to fill Democrat John Kerry's seat.

A person familiar with the decision says Brown will not run. The person wasn't authorized to discuss the matter and spoke on condition of anonymity.

Brown was defeated in November by Democratic Sen. Elizabeth Warren. He had won the seat in a special election in 2010.

U.S. Reps. Edward Markey and Stephen Lynch are seeking the Democratic nomination for the seat being vacated by Kerry, who is leaving the Senate to become Secretary of State.

The Democratic and Republican primaries are scheduled for April 30 and the special election for June 25. Gov. Deval Patrick has named William "Mo" Cowan, a former top aide, to fill the seat on an interim basis until the election.