Arlington County Board member Christian Dorsey resigned from the Metro board Thursday, a move that apparently cleared him of the obligation to repay a $10,000 campaign donation from Metro’s biggest labor union.

The Northern Virginia Transportation Commission, which appoints Metro members from Virginia, announced at midday Thursday that Dorsey (D) had stepped down. His position will be filled by Matthew F. LeTourneau, the Virginia alternate, through February.

The NVTC board will appoint a permanent replacement at its March 5 meeting, commission chair Katie Cristol said in an email to commission members.

“We thank Christian for his exemplary service since he assumed the role as the NVTC principal appointee to WMATA in July 2018,” wrote Cristol, who also serves on the Arlington County Board with Dorsey. “We are particularly grateful for the model he has set as the first regional, rather than local, appointee to the WMATA Board during a time of transition.”

In a text message Thursday afternoon, Dorsey said “It was an honor to serve Northern Virginia jurisdictions on the Metro Board.”

His resignation appears to clear him of the obligation to repay the $10,000 donation from the Amalgamated Transit Union, which represents about 13,000 Metro employees. The money went toward his successful campaign for a second term on the Arlington board; the Metro board had said it posed a conflict of interest.

“That was a requirement we had if he were to continue on the board,” said Paul C. Smedberg, Metro board chairman who called the ethics committee into session Thursday. “When he resigned from the board, the issue is effectively resolved.”

Dorsey was reprimanded by the board in November. He had waited four months to notify Metro of the donation, a violation of the board’s ethics policy, which requires notification within 10 days.

A similar misstep resulted in the resignation of former Metro board chairman Jack Evans in June.

The Metro board insisted that Dorsey return the donation and forced him to give up his finance committee chairmanship, saying he improperly participated in board discussions involving union interests when he should have recused himself.

Although Dorsey agreed in November to return the money, he said in an interview Wednesday that he has not yet done so because donations he solicited to cover the costs had not come through. He said Thursday that he still plans to return the money.

As the chairman of Metro’s finance committee, Dorsey often dealt with labor matters, but he said he never let donations compromise his behavior or performance of his duties.

Since Nov. 7, when the board reprimanded him, Dorsey has missed eight of 14 Metro meetings and recused himself from three committee meetings where budget preparations were discussed, Metro officials said.

Smedberg said Wednesday that the ethics committee would consider additional sanctions against Dorsey on Thursday because he had not repaid the money.

But with Dorsey off the board, no sanctions were imposed.

Dorsey’s last required report to the Virginia State Department of Elections showed $3,298 left in his campaign account as of Dec. 31. After the November election, he raised about $2,700, and repaid himself $1,999 of the $22,300 he lent his campaign since 2015, which the campaign has been slowly repaying. A debt of about $201 is left.

Last summer, Dorsey paid his wife, a graphic designer, $8,000 for her work on the campaign literature and as his campaign manager.

Dorsey has also received donations between $2,750 and $10,000 from Arlington firefighters, and unions representing laborers, carpenters and electricians.

He got a $1,500 donation in December 2018 from Volkert, an engineering firm that has a right of way and traffic engineering contract related to Metro’s Silver Line. He also received a $1,000 donation in November from James V. Williams III of the law firm Schulte Roth & Zabel, the same firm that undertook the Metro board’s ethics investigation of Evans.

A Metro spokesman said the donations were not problematic because Volkert’s contract was not directly with Metro, and Williams is a longtime personal acquaintance of Dorsey.

Dorsey served four years on the Metro board, and had been a voting member since mid-2018.

He filed for personal bankruptcy filed in mid-October, saying he had gone deep into debt after cutting back on his private-sector work to focus on his government duties.