From MLB.com:

Pat Dobson, 64, one of four Baltimore Orioles pitchers to win 20 games in 1971, died in a San Diego area hospital on Wednesday night. The cause of death was not immediately known. ...

Dobson was 122-129 lifetime with a 3.54 ERA in 414 games (279 starts) for Detroit, San Diego, Baltimore, Atlanta, the New York Yankees and Cleveland from 1967-77. He helped guide the Tigers to the 1968 world championship, while his 1971 Orioles club lost to the Pirates in the World Series. He was an All-Star with the Orioles in 1972, though he finished 16-18, but with a 2.65 ERA.

Dobson was traded to the Yankees on June 7, 1973 in exchange for Frank Tepedino, Wayne Nordhagen, Dave Cheadle and Al Closter. In his 2 and 1/2 plus seasons in New York, he was 39-37 with a 3.65 ERA. On November 22, 1975, he was traded to Cleveland for Oscar Gamble.