WASHINGTON (AP) — Thomas Hale Boggs Jr., a son of congressional royalty who evolved into a top-tier lobbyist and prolific Democratic fundraiser and embodied what it meant to have Washington clout, died Monday He was 73.

His brother-in-law, journalist Steve Roberts, said Boggs died Monday morning at his home in the Washington suburb of Chevy Chase, Maryland. The cause of death has not been determined, but the family suspected a heart attack, Roberts said.