Casso killed the builder of the house when the builder wanted to get paid
I looked up Casso's explanation on why he had the architect (Anthony Fava) whacked. From Casso's own mouth, but he has been known to fabricate....
This was during the time period when Fat Pete flipped. The architect had also done work on Fat Pete's house. So, Casso figured he knew too much and had him killed. Casso was rolling in dough and spending lavishly at the time, so he could have easily afforded to pay.
That doesn't explain why Fava was brutally tortured before he was whacked. Casso explained that he wasn't supposed to have been tortured but the assassins got carried away. Fava's genitals were mutilated, leading to speculation that there was something inappropriate going on with Lillian (wife), but Casso denied that theory.
