Lewis Collins.
The actor, who played Bodie in the cult 1970s TV series, alongside Martin Shaw (Doyle), died in Los Angeles after a five-year struggle with cancer, BBC reports.
His agent said: "He died peacefully at his LA home surrounded by his family. Privacy is asked for at this very sad time."
The Professionals was based around the adventures of a fictional crime fighting unit called CI5 and also starred Gordon Jackson as George Cowley.
The ITV show became huge hit in the late 1970s and early 1980s.
Collins's other notable roles included SAS captain Peter Skellen in 1982's Who Dares Wins.
Jackson died in 1990.
