Question: The Panic at the Disco song "Northern Downpour" was written by Jon Walker and a member that left the band in what year? 

Context articles: Ryan Ross
Jon Walker
Vices &amp; Virtues
Take a Vacation!
Jake Sinclair (musician)
The Young Veins
Panic! at the Disco
Nine in the Afternoon
New Perspective (song)
Northern Downpour

George Ryan Ross III (born August 30, 1986) is an American musician, singer, and songwriter best known for his work as the lead guitarist and primary songwriter of the band Panic!
 at the Disco before his departure in 2009.
 Ross and former Panic bassist Jon Walker are the founding members of the band The Young Veins, in which Ross is the lead vocalist.
Jonathan Jacob "Jon" Walker (born September 17, 1985) is an American musician.
 Formerly the bassist of Panic!
 at the Disco, Walker was also the lead guitarist and occasional split vocalist of The Young Veins (which he founded with former Panic!
 lead guitarist Ryan Ross), now on indefinite hiatus.
 Having went on to release several solo recordings, he is now mostly songwriting and producing.
Vices & Virtues is the third studio album by American rock band Panic!
 at the Disco, released on March 22, 2011 on Fueled by Ramen.
 Produced by John Feldmann and Butch Walker, the album was recorded as a duo by vocalist and multi-instrumentalist Brendon Urie and drummer Spencer Smith, following the departure of lead guitarist, backing vocalist and primary lyricist Ryan Ross and bassist/backing vocalist Jon Walker in July 2009.
 The album's artwork was conceptualized by touring bassist Dallon Weekes who was inducted as a full-time member of the band near the end of recording.
Take a Vacation!
 is the debut studio album by American rock band The Young Veins, and the first musical project by Ryan Ross and Jon Walker after their departure from Panic!
 at the Disco.
Jake Sinclair (born March 7, 1985) is an American record producer, audio engineer, mixing engineer, multi-instrumentalist, vocalist, and songwriter.
 His production, engineering, songwriting, and mixing credits include Weezer, Fall Out Boy, Panic!
 at the Disco, 5 Seconds of Summer, Pink, New Politics, Andrew McMahon in the Wilderness, Gin Wigmore, and Train.
 Sinclair co-wrote and produced Panic!
 at the Disco's "Death of a Bachelor" album (which debuted at number one on the US Billboard 200) and produced Weezer's 2016 "Weezer (White Album)".
 Both were nominated for Best Rock Album at the 59th Annual Grammy Awards.
 He co-wrote and produced "Uma Thurman" by Fall Out Boy, which debuted at number one on the U.S. iTunes Chart, reached number 22 on the Billboard Hot 100, and was certified 2X Platinum by the RIAA in December 2015.
 Sinclair received a Grammy nomination for Album of the Year for his work as engineer and bassist on Taylor Swift's "Everything Has Changed" alongside producer Butch Walker.
 He co-wrote and produced the debut single, "She Looks So Perfect" by 5 Seconds of Summer that peaked at number one in over five countries and won "Song of the Year" at the 2014 ARIA Awards.
 Sinclair is the former bassist of the indie/pop rock band The Films and the lead singer and producer of the indie pop duo Alohaha.
The Young Veins were a rock band from Echo Park, California.
 The band was composed of Ryan Ross and Jon Walker, two former members of the Las Vegas band Panic!
 at the Disco, along with bassist Andy Soukal, drummer Nick Murray and keyboardist Nick White.
Panic!
 at the Disco is an American rock band from Las Vegas, Nevada, formed in 2004 and featuring the current lineup of vocalist Brendon Urie, accompanied on tour by bassist Dallon Weekes, guitarist Kenneth Harris and drummer Dan Pawlovich.
 Founded by childhood friends Ryan Ross, Spencer Smith, Brent Wilson and Urie, Panic!
 at the Disco recorded its first demos while its members were in high school.
 Shortly after, the band recorded and released its debut studio album, "A Fever You Can't Sweat Out" (2005).
 Popularized by the second single, "I Write Sins Not Tragedies", the album was certified double platinum in the US.
 In 2006, founding bassist Brent Wilson was fired from the band during an extensive world tour and subsequently replaced by Jon Walker.
"Nine in the Afternoon" is a song by American rock band Panic at the Disco, and the first single from the group's second album "Pretty Odd".
 It is the band's first song release that did not include the exclamation mark at the end of the "Panic" in the group's name, and was also the first song written for the album.
 The video was filmed on December 20 and December 21.
 It was the first song written after the band decided to scrap an entire album of songs that the members had been planning to release in the autumn of 2007.
 Panic at the Disco's first performance of "Nine in the Afternoon" was at Virgin Festival 2007.
 The song has gone under changes in key and lyrics since first being performed.
 This song was number 44 on "Rolling Stone"' s list of the 100 Best Songs of 2008.
"New Perspective" is a song by American rock band Panic!
 at the Disco, released on July 28, 2009 as a single promoting the film "Jennifer's Body".
 Vocalist Brendon Urie began writing the song two years prior to its recording regarding a lucid dream he had.
 The song was completed in the summer of 2009, and was co-written by producer John Feldmann.
 "New Perspective" was Panic!
 at the Disco's first single in aftermath of the departure of guitarist Ryan Ross and bassist Jon Walker, both of whom had no involvement in the track.
"Northern Downpour" is a song by American rock band Panic at the Disco from their second studio album, "Pretty.
 Odd.
" (2008).
 The song was released on November 14, 2008, as the fourth and final single from the album.
 The song was written by guitarist Ryan Ross and bassist Jon Walker, and was their final single with the band.