Daniel Furniss, the passionate, gregarious go-to trial lawyer at Townsend and Townsend and Crew, suffered a heart attack and died early Friday morning. He was 58.

The man who helped win a $1.1 billion antitrust settlement from Microsoft Corp. was in Townsend’s Palo Alto, Calif., office Thursday in a chipper mood, talking, as he did, with everyone, said Theodore Herhold, a longtime friend and law partner.