Lets clear some things up here:
Yes Hickenlooper is friends with the probable killers father. The kid was not paroled early or given any special treatment really. He served his full sentence and was released.
During that sentence he was held in solitary confinement for basically the entire term. His father believed (before these killings) that it had led to real degeneration in his mental state. Hickenlooper even referenced it in the press conference he gave after the commissioner was murdered.
Lets keep our facts straight please.