The pilot of the plane that crash-landed at Martha’s Vineyard Airport last week has died, officials said Friday.

Randolph Bonnist, the 79-year-old man who had a medical emergency while flying the small private plane Saturday, died at Boston Medical Center on Thursday night, the Cape and Islands District Attorney’s Office said in a statement.

Mr. Bonnist, who was from Norwalk, Conn., was flying his Piper Meridian plane and approaching the Island airport at about 3 p.m. on July 20. He then took ill, according to officials, forcing Robin Bonnist, his wife and the only other passenger in the plane, to take over the controls.

Ms. Bonnist, 68, crash-landed the plane off the runway at the airport. She was uninjured but Mr. Bonnist was flown by a medical helicopter to Boston and was said to be in serious condition earlier last week.

The district attorney’s office said no foul play is suspected, and the Federal Aviation Administration and National Transportation Safety Board are investigating the incident.

The couple had flown the plane from the Westchester County Airport in White Plains, N.Y. earlier in the afternoon.

The district attorney's office declined to comment further on Mr. Bonnist's death out of respect for his family.