The scene was extremely somber ... Kalabrya was seen wiping away tears throughout the ceremony after reportedly saying some words during it.

Kalabrya did release a dove in honor of Dwayne outside ... before his body was taken away to be transferred to New Jersey for another memorial service on Saturday.

Shazier -- a former Steeler and Buckeye -- was also spotted at Haskins' memorial walking into the church ... as well as defensive tackle Cam Heyward.

As we previously reported, the Steelers QB was tragically killed after being struck by a dump truck on a highway in Fort Lauderdale Florida on April 9.

The crash report indicates the 24-year-old was hit by two cars and succumbed to his injuries on the scene.