Representative Thomas Kean Jr., absent from congressional duties in Washington since March, has returned to his New Jersey residence. On Wednesday evening, he was observed at home, bringing an end to his nearly four-month absence.

Mr. Kean was spotted from the street on Wednesday night, positioned in a well-lit room of his Westfield home shortly before 8:45 p.m. Dressed in a dark suit and a red tie, he greeted a New York Times reporter at his door. “It’s good to see you,” he remarked, indicating he would speak the following week and then closed the door.

His wife, Rhonda, was present in the background, offering a pleasant smile. Additional comments were not provided by Mr. Kean at that time.

Aides associated with the 57-year-old congressman had previously stated that he was being treated for a health condition, expecting a full recovery. However, specifics regarding his health were sparse as he missed over 100 floor votes since mid-March.

Mr. Kean, representing the Republican Party, is campaigning for a third term in November. The upcoming election is considered one of the nation’s closely contested midterm races. His prolonged absence has caused frustration among some of his primary Republican supporters.