Thomas Green entered the plea Thursday as part of a deal with Atlantic County prosecutors. They will recommend that he receive a 20-year state prison term when he's sentenced Oct. 5.
The 65-year-old Green was charged in the December 2016 death of 52-year-old city resident Ricky Ward.
Prosecutors have said Green hit Ward in the head "multiple times" with the rock, but they haven't disclosed a motive for the attack.
Green will have to serve nearly 19 years before he becomes eligible for parole.
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