What is the reason given for denying parole of Sirhan B. Sirhan?
He murdered Senator Robert F. Kennedy and is considered a threat to society. Many murderers in the USA never get parole. They get life imprisonment without parole. Sirhan is lucky he was not executed for the 1968 murder. He also shot and wounded several other people when he gunned down Senator Kennedy.
Is it legal for judges in New York State to give released inmates 5 years parole beyond their parole time?
Not really enough information is given in the question to answer this -but- that being said - if its being done and has never been challenged, you can rest assured tht it is undoubtedly legal. [HYPOTHETICALLY: If the inmate was given so-called "early parole" then the judge may have added additional parole time to bring the parole period more in-line with the original sentence.]