What is the highest fine levied for homicide in the Salic Law?
Salic Law existed as the governing law of the Frankish tribes and later societies. The main basis of the criminal law was to levy fees for crimes. These fees, when paid, were split between the governing body and the family the crime was enacted against. Fines varied based upon the individual law broken.
In regard to murder, the fines spanned a few undetermined shillings (for the death of a Roman "obliged to pay tribute" to the king) to 72000 denars (today one dollar equals 2 denars) for murdering a man in the service of the king, throwing him into a water well, and concealing the murder.
I have linked the Salic fines site (completed by Yale University) below for you.