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By Joy Johnston, Cox Media Group National Content Desk

EVANS MILLS, N.Y. — Three dozen law enforcement officers came together to finish a project started by New York State Trooper Joel Davis, who was killed in the line of duty July 9.

Davis, 36, had started work on a treehouse for his daughter, Jaila, but he was killed before it could be finished. Davis died days before Jaila’s 13th birthday, Syracuse.com reported.

This week, dozens of active and retired officers helped finish the building of the treehouse. A flag with a blue line was placed on the railing in memory of Davis. Jaila posed for a photo in the treehouse upon its completion.

Davis was responding to a domestic violence call when he was fatally shot, Syracuse.com reported.