[3] Hargreaves was mainly a film actor, but is well-remembered by Australian audiences for the title role in the TV drama Young Ramsay in the 1970s and worked in a number of stage productions.

Hargreaves had roles in The Removalists, Don's Party, The Odd Angry Shot, and Malcolm.

[4] Although he had exclusively heterosexual relationships while young, by the early 1980s Hargreaves acknowledged and embraced his homosexuality.

[4][5] Hargreaves contracted HIV about 1994 and died of AIDS-related complications in a hospice in Sydney on 8 January 1996.

[4] Pallbearers at Hargreaves' funeral included actors Sam Neill and Bryan Brown.