WEST (CBSDFDW.COM) — Friends and family in the small town of West are preparing to honor victims of the deadly fertilizer plant explosion that occurred one year ago today.

The mayor and city officials want Thursday’s memorial to serve as a healing milestone and help the grieving community move forward from the accident that killed 15.

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But for families like the Calvin family, moving on isn’t easy.

Just three weeks before Perry Calvin was killed in the blast, he and his wife, Becky, learned that there would be a new addition to the family.

Presley Calvin was born last November, and Becky says it’s sad knowing her perfect little baby won’t know the volunteer firefighter who ran in to help save lives one year ago today.

“Everyone will tell stories. I just hate that she will never know him like the rest of us did.”

Perry’s father says it’s tough enough to get on his tractor and not see his son on the other side of the family’s field.

The memorial, which will be held at the West Fair and Rodeo Grounds, will include prayers and songs and words of comfort.

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During the memorial, West’s Mayor Tommy Muska will give a State of the City address, introducing a video that highlights the rebuilding and recovery efforts in the community.

A moment of silence will be held at 7:51 p.m., the exact time the explosion occurred last year.

(©2014 CBS Local Media, a division of CBS Radio Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)

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