PKR's Hulu Selangor parliamentarian Dr Zainal Abidin Ahmad passed away this evening
Zainal Abidin, 71, was the former Selangor deputy menteri besar.
In the 2008 general elections, Zainal Abidin defeated MIC deputy president G Palanivel by a tissue-thin majority of 193 votes.
Under the election law, the Election Commission will have to call a by-election within 60 days of the seat falling vacant.
With his seat now vacant, the country will see its 10th by-election since the 12th General Election on March 8, 2008.
The other by-elections were in Permatang Pauh, Penanti and Permatang Pasir (Penang); Kuala Terengganu; Bukit Selambau (Kedah); Bukit Gantang (Perak); Batang Ai (Sarawak); Manek Urai (Kelantan); and Bagan Pinang (Negri Sembilan).