Tears welled in the eyes of Worcester Fire Chief Michael Lavoie Tuesday as he spoke about the approaching 20th anniversary of the blaze that claimed the lives of six firefighters. “It’s still agonizing. It’s still emotional. We have to be here. We can’t forget,” Lavoie said. “We have to have these ceremonies. Every single one of these deaths take a little piece out of us. It just brings us back here. We can never forget.” Behind Lavoie, a pair of red baseball jerseys that say Worcester across the front hung on the Engine 12 fire truck inside the Franklin Street Fire Station. No player for the organization will ever wear No. 6 as the team announced the number would be retired to honor those firefighters who died 20 years ago in the Worcester Cold Storage and Warehouse Co. fire, the Worcester Red Sox announced Tuesday afternoon.