Serial killer 'Son of Sam' David Berkowitz speaks out on finding Jesus

Four decades after his brutal murder spree, "Son of Sam" serial killer David Berkowitz claims he's a changed man -- one who has found Jesus and considers himself a born-again Christian.

Those revelations come from those who have visited Berkowitz, now 64, in prison decades after his arrest. Today, Berkowitz calls himself the "Son of Hope."

SEE MORE: Mother of first Son of Sam victim still devastated after 40 years​​

His killing spree -- which began in 1976 and lasted through the summer of 1977 -- left six dead and even more wounded.

According to minister Roxanne Tauriello, a frequent visitor of Berkowitz's, the deaths still haunt him.

See what Berkowitz looks like after years in prison:

"David grieves over that a lot, and you can't say to him — you never want to say 'Son of Sam' in front of him," Tauriello told People in a new interview. "He never uses that name, ever."

"He is genuinely sorrowful and does not want to get out of prison," she added in the interview. "He knows he deserved to die and deserves to be exactly where he is."

His release is unlikely, since he is currently serving six consecutive 25 years to life terms since pleading guilty to murder in May 1978.

But, in a new Investigation Discovery documentary called Son of Sam: The Hunt For a Killer, some say they don't believe he has changed from the man who rampaged the city with a .44 caliber handgun, targeting women and couples and who taunted the press and law enforcement with letters.