A post mortem performed on the body of Member of Parliament for Portland Eastern Dr Lynvale Bloomfield on Friday revealed that he died of multiple stab wounds.
Dr Bloomfield was found murdered at his house in Passley Gardens, Portland on February 2.
Detectives from the Major Investigation Division have collected statements and are searching for possible witnesses.
The knife reportedly used in the attack and other items removed from Dr. Bloomfield's house have been submitted to the government forensic laboratory for testing.
The People's National Party has partnered with Crime Stop to offer a reward of $500,000 for information leading to the case being solved.