Question:  "I Saw Her Again" was co-written by what Canadian singer born in 1940?

Context paragraphs:
Diana Trask: Diana Trask (born 23 June 1940) is an Australian country and pop singer born in Melbourne, Australia.  She was a popular country singer during the 1970s in the United States and also was a popular star in her native Australia.  In the U.S., she charted eighteen singles on the country charts, of which the highest was the number 13 "Lean It All on Me" in 1974.

Mounira El Mahdeya: Mounira El Mahdeya (born Zakiyya Hassan) (Arabic: منيرة المهدية‎ ‎ ) was an Egyptian singer born in 1885 in Alexandria; she died in 1965.  The singer, better known under the nickname of "Sultana of the song" or "The Sultana", was considered to be the leading Egyptian singer between the two wars.

Carl Henry (singer): Carl Henry is a Canadian R&B singer born in Jamaica and raised in Montreal, Quebec, Canada.

I Saw Her Again: "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.

Bai Hong: Bai Hong (1919 - 1992) was a Chinese actress and singer born Bai Li Zhu (白丽珠) in Beijing.  By the 1940s, she became one of the Seven great singing stars.

Denny Doherty: 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.

Jérémy Gabriel: Jeremy Gabriel, also known as Le Petit Jeremy, in Quebec, is a French Canadian singer born December 10, 1996, in Charlesbourg, Quebec City.

Shirley Matthews: Shirley Matthews was a Canadian pop singer born in Harrow, Ontario in 1942.

Luce Dufault: Luce Dufault is a Canadian singer born on August 19, 1966, in Orleans, Ontario.  She is of French descent.  She played in two musicals from Luc Plamondon, La Légende de Jimmy and Starmania.  She recorded a few hits including "Soirs de scotch", "Au delà des mots" and "Ce qu'il reste de nous".

Fefe Dobson: 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.

Supporting paragraphs: I Saw Her Again Denny Doherty
Answer: Dennis Gerrard Stephen Doherty