"Do not rush into conclusions without considering the evidence here. While humans are a barbaric race, they are not without their merits. That being said, judging by the cause of death here, it appears there is definitely an element of the arcane involved. Although the direct cause of death seems to be exvivification, I am unfamiliar with the methodologies involved in necromancy." R'lyeh began to examine the male goblin rather casually as if it was the norm for him to begin corpse studies on another person's loved one. "I am not accustomed to goblin death rites, however I discern cause of death here to be related to this stab wound, given the angle and, depth of penetration, and shape of the wound..." Yes, he had a webbed finger exploring the body. "It feels like a dagger, slight bruising around the entry suggests a hilted dagger of significant force. A coupe-de-gras which, had unfortunately met a wall of flesh.  Yet the lack of wounds from the others suggest the rest were magically slain. Or poisoned. Or suffocated. Either way, their biological processes had suddenly came to a stop without external injuries." 

"What's this? Oh. Oh. That is unfortunate. It appears I have found a slight blockage in his coronary arteries. A slight build up of fatty deposits it seems." R'lyeh withdrew his hand, covered in blood as he wiped it using a nearby cloth. "I am sorry Ms. Friends, however your father would have suffered a fatal cardiac arrest within a few days regardless of his current state. Shall we consume your family members in their memory? Or do Goblins also bury their deceased?"