Del. Scott A. Surovell plans to announce Sunday that he is running for the Virginia state Senate seat held by Sen. Linda T. “Toddy” Puller, a fellow Fairfax County Democrat who said Wednesday that she will retire this year after 23 years in public office.

Surovell, a 43-year-old trial lawyer who lives in Mount Vernon with his wife and four children, was elected to the House in 2009. He serves as chairman of the House Democratic Caucus.

“I’ve lived in the 36th District my entire life,” Surovell said in an interview ahead of Sunday’s formal announcement. “I went to high school with Toddy’s kids. She’s been an incredible advocate for the transformation of Route 1, for veterans, for education. We need somebody to take up that work and continue it, and make sure southeastern parts of Fairfax County and Prince William County and northern Stafford get to enjoy the same quality of life as the rest of Northern Virginia.”

The heavily Democratic district extends along Route 1 from near the Capital Beltway to the Marine Corps Base in Quantico. Gov. Terry McAuliffe (D) won the district in 2013 by a 25-point margin.

Dumfries Mayor Jerry Foreman (R) previously announced that he would seek the seat.