2001, Rivervale and Compassvale fell within the newly-formed Pasir Ris–Punggol GRC, as part of the Punggol South and Punggol Central wards, with Michael Lim and Charles Chong respectively as their MPs. Most of Anchorvale and Fernvale fell within the Jalan Kayu division of Ang Mo Kio GRC, under Wee Siew Kim. In the 2006 general election, Pasir Ris–Punggol GRC was expanded from five to six MPs as the population in Sengkang and Punggol new towns had grown since 2001. As such, the Punggol East ward was formed from parts of the Punggol South and Punggol North wards, served by Michael Palmer. Michael Lim retired from politics in 2006 and did not take part in the election that year, with Teo Ser Luck replacing him in the Punggol South ward. Meanwhile, in Ang Mo Kio GRC, Jalan Kayu division was carved to include Sengkang West ward, returning debut MP Lam Pin Min to parliament. Most of Rivervale was carved out of Pasir Ris–Punggol GRC to form the Punggol East SMC in the 2011 general election. Punggol East SMC saw the only three-cornered fight in the 2011 elections, with Palmer from the People's Action Party, Desmond Lim from the Singapore Democratic Alliance, and Lee Li Lian from the Workers' Party contesting, eventually the SMC was retained by incumbent Michael Palmer. Compassvale, and a small portion of Rivervale, came under the Punggol South and Punggol Central divisions of Pasir Ris–Punggol GRC, with Teo Ser Luck taking over as MP for Punggol Central from Charles Chong, and Gan Thiam Poh replacing Teo in Punggol South. Anchorvale and Fernvale were carved into Sengkang West SMC, with Lam Pin Min as its MP. In December 2012, Palmer quit the PAP over an extra-marital affair, thereby vacating his seat and paving the way for a by-election in Punggol East SMC that was called by the Prime Minister in January 2013. SDA's Lim and WP's Lee returned to contest the by-election, and the PAP fielded a newcomer, Koh Poh Koon, who had joined the party only three weeks earlier. They were joined by a fourth competing party, the Reform Party, represented by its secretary-general Kenneth Jeyaretnam. Despite this being a four-way fight, WP's Lee emerged victorious with 54.52% of valid votes cast, shocking many on both sides of the political divide, who expected it to be a close fight. PAP's Koh came in second with 43.71% of the