Chang Si-liang specialized in criminal investigation while attending Central Police University, from which he graduated in 1965.
11 Facts About Chang Si-liang
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Chang Si-liang subsequently led precincts within Taipei City Police Department, served as TCPD's deputy commissioner, led Hualien Police Department, and served as Third Peace Preservation Police chief.
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In 1999, Chang Si-liang became head of the Aviation Police Bureau, which he had served previously as second-in-command.
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On 1 July 2003, Chang Si-liang succeeded Wang Ginn-wang as director-general of the National Police Agency.
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That same month, Chang Si-liang participated in a drug raid of the largest nightclub in Taiwan, alongside interior minister Yu Cheng-hsien and Criminal Investigation Bureau commissioner Hou You-yi.
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Less than a week after the investigations began, Chang Si-liang stated that 119 cases of possible vote buying had been reported.
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In December 2003, Chang Si-liang was invited to serve on a task force focusing on electoral fraud.
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On 19 March 2004, Chang Si-liang convened a meeting to discuss law enforcement during the 2004 presidential election, to be held the next day.
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Chang Si-liang resigned as director-general of the National Police Agency on 5 April 2004, to take responsibility for the attack on Chen and Lu.
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The resignation of interior minister Yu Cheng-hsien for the same reason was approved prior to Chang Si-liang's, leaving Yu's successor Su Jia-chyuan to decide Chang Si-liang's status.
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Chang Si-liang's funeral was held on 7 December 2024, in Taipei.