After meeting in 1963, Hoffman married Anne Byrne in May 1969. He adopted Karina (b. 1966), Byrne's child from a previous marriage, and with Byrne had daughter Jenna (born October 15, 1970). In 1970 Hoffman and Byrne were living in Greenwich Village in a building next door to a townhouse occupied at the time by members of the Weathermen, when a bomb was accidentally detonated in the townhouse's basement, killing three. In the 2002 documentary "The Weather Underground", Hoffman can be seen standing in the street during the aftermath of the explosion. The couple divorced in 1980.