In his heyday, Dr Wong testified in several seminal court cases as an expert witness, including in the murder trial of Freddy Tan in 1968 which led to the abolition of the jury system.
I think we have to look at what “including” is referring to.
If the author means “including testifying in the murder trial…” the sentence is correct and, I think, draws a stronger relationship between Dr. Wong’s testimony and the abolition of the jury system.
If he means “including the court case of the murder trial…” then “in” should be deleted and the comma included.