The only thing, I found was it stated Angellino was consigliere and a possible candidate for Acting boss of the Colombo family and Carmine Sessa personally killed him and took his spot as consigliere. So was Angellino a Orena loyalist? Why would Sessa kill Angellino and get his spot?
Both factions wanted him dead
He was power hungry, so orena and his cousin carmine ordered the hit