James McDonald, a prominent adviser to wealthy families as chief executive of investment management group Rockefeller & Co, died of a single gunshot wound on Sunday, local authorities said on Tuesday.

McDonald, 56, was found dead in his car near a strip mall in Dartmouth, Massachusetts on Sunday afternoon. Police are still investigating.

"The preliminary investigation concludes that this was an apparent suicide," Gregg Miliote, a spokesman for Bristol County District Attorney Sam Sutter said.

McDonald won praise for growing Rockefeller & Co, the New York-based family office established by oil tycoon John D. Rockefeller in 1882 to manage the dynasty's assets, into a broader investment

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