The Stoning of St. Stephen (Rembrandt 1625)
This is the first I've heard of the cattle sacrifice you mention. There is a strong suspicion among the people who knew him that something rather conspicuously satanic was employed on that dark day, involving some of the local residents there (I will not say any more), to the effect that no suspects are known to be under surveillance by the local law enforcement agenc(ies).
The ritual execution-style murder had key elements, like the evidence left had to be just so, such that the demonic power invoked could be effective. This would explain the lack of suspects. The result is to heighten the fear communicated to others who survive him, and to give satanists more confidence in their nefarious undertakings.
This is why we pray we would not fear our enemy, but rather pray for his conversion, like St. Stephen; and that we might be able by our prayer and God's grace to overcome our own temptation within, as St. Lawrence did.
The calf sacrifice happened exactly 24 hours prior to his death. Slice the throat/drain the blood and sacrifice to their god. Some farmers/owners do not even report and those that have just regard it as a ritual of a satanic cult. It happens all over the world. Some extreme elements of a particular religion still believe in this sacrifice. I strongly believe Kunz knew too much...they used the calf and Kunz as an offering. Kunz had his throat sliced as well.
Was Christ offered blood at The Last Supper?