Rep. George Miller (D-Calif.), a close ally of House Minority Leader Nancy Pelosi (D-Calif.), announced Monday that he will not seek reelection in 2014.

"I’m proud of what I've been able to accomplish on behalf of children and families, working people and the environment and I look forward to working in new venues on the issues that have inspired me," Miller said in a statement.

The news was first reported by Politico.

Miller has served in Congress since 1975, winning in the first election following the Watergate scandal. Only four House members have served longer and only one other member of that class remains in the House -- Rep. Henry Waxman (D-Calif.).

He is the fourth Democrat and 13th House member overall to announce he won't seek reelection this year.

He comes from a safe Democratic district, where President Obama has taken more than two-thirds of the vote in both of his presidential elections. Democrats will be heavily favored to retain the seat.

He first informed Pelosi of his decision on Wednesday, according to House Democratic aides.

Pelosi, a former speaker, said in a statement that she is saddened by the departure of perhaps her closest confidant, but that she knows Miller will be successful in future endeavors.

"For me, as speaker and Democratic leader, George’s patriotism, wisdom and guidance have been especially valued, and he has been a close friend since my first days in the House," Pelosi said.

Current Speaker John Boehner (R-Ohio) also had words of praise for Miller.

"No one would confuse me and George Miller for ideological soul mates, but during our years serving together on the Education & the Workforce Committee, we got things done on behalf of the American people, thanks in no small part to his dedication and willingness to work for the greater good," Boehner said.

Updated at 1:40 p.m.