Mohd Sedek joined the Police Force on 3 January 1973 as Cadet Assistant Superintendent of Police.
After complete training, he was placed to Criminal Investigation Department in Johor Bahru Police District Headquarters as Investigating Officer for 7 months.
In addition, he also held positions such as Muar District Police Chief, Seremban District Police Chief, Head of Perak and Selangor Criminal Investigation Department, Kelantan Police Chief, Perak Police Chief, Deputy Director of Criminal Investigation Department, Director of Narcotics Criminal Investigation Department and Director of Internal Security and Public Order Department.
On 13 January 2004, Mohd Sedek was appointed as Deputy Inspector-General of Police[1] and he was retired a year later.
[2] On 22 January 2010, Mohd Sedek died at Kuala Lumpur Hospital due to bad conditions at the age 60.