Heasley praised both Murphy's crucial contribution and the overall team effort.
"Liam came up with something special but the whole campaign has been pretty special," Heasley said as he tidied the team's subs area.
"The brotherhood within the squad shone through as we came from behind more than once in the final. All of the team deserve praise for their defensive effort and I would like to think we will get at least three or four players to the New Zealand under-20 trials."
Winger Zane Crook scored the Bay's other try. His Napier Technical clubmate and 2011 New Zealand Secondary Schools halfback Sheridan Rangihuna kicked two penalties and a conversion.
Marshall and No8 Levi Guildford were again inspirational in the Bay pack. Second-five Ted Walters was a rock on defence and always a threat on attack, while the versatile Tamati Samuels provided classy impact off the bench as a winger.
Equally as thrilled as Murphy was co-coach Somerville.
"There's some justice for last year," Somerville said, referring to the fact the Hawke's Bay under-16 side he was co-coach of last year was pipped in the final minute of their final against Wellington in New Plymouth.