An identification from Youtube in the comments section of this video
of Davide Commendatore:
Im the son of the actor playing the doctor who make a valutation of the man who died falling out of the chairs: Angelo Commendatore there was also my uncle the brother of my father the man with glasses on the right second row after Silvia Koscina
Sono il figlio del dottore che valuta la morte di quello che cade dalle scale, Angelo commendatore, c'era anche mio zio il fratello di mio padre,con gli occhiali sulla destra del teleschermo seconda fila dopo Silvia coscina
Probably i will try to ask him on that page the name of his uncle too, hopefully he will answer looking at the notification.
Full casts of Italian Giallo movies
Mystery with stylish and sadistic killers