question:  "I Saw Her Again" was co-written by what Canadian singer born in 1940?
answer: Dennis Gerrard Stephen Doherty
context: Title: Fefe Dobson
  Passage: Felicia Lily "Fefe" Dobson (born February 28, 1985) is a Canadian singer and songwriter.  Born in Toronto, Ontario, she began performing as a teenager, during which she received and refused an offer from Jive Records for a recording contract.  Dobson signed with Island/Def Jam soon after and released her self-titled debut album (2003), which saw the success of the singles "Bye Bye Boyfriend" and "Don't Go (Girls and Boys)" on the Canadian Hot 100 chart and for which she received two Juno Award nominations.
  Title: I Saw Her Again
  Passage: "I Saw Her Again" is a pop song recorded by the U.S. vocal group the Mamas & the Papas in 1966.  Co-written by band members John Phillips and Denny Doherty, it was released as a single in June 1966 (WLS played it most of that month) and peaked at number one on the "RPM" Canadian Singles Chart, number 11 on the UK Singles Chart, and number five on the "Billboard" Hot 100 pop singles chart in July 1966.  It appeared on their eponymous second album in September 1966.
  Title: Denny Doherty
  Passage: Dennis Gerrard Stephen Doherty (November 29, 1940 – January 19, 2007) was a Canadian singer, songwriter, musician and actor.  He was most widely known as a founding member of the 1960s musical group The Mamas & the Papas.
citations: I Saw Her Again Denny Doherty