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Some of the victims were part of a group attending a party at the restaurant in advance of a couple’s anniversary celebration scheduled for later Saturday, authorities said.

Mr. Mackin, 30, and his wife, Tanisha, married in Texas a year ago and had returned to celebrate with Buffalo-area friends and family, authorities said. Mr. Mackin was killed; Mrs. Mackin was unhurt.

The Mackins, who grew up in the same neighborhood, had been friends since they were 13, according to a website created to commemorate their marriage and provide details about the celebration.

The couple, known as “Dee” and “Tee,” have a 6-year-old son, Danyell Jr., and a 7-month-old daughter, Destinee, who was scheduled to be christened on Sunday, the website said. The family moved from Buffalo to Austin, Texas, in 2006, and the Mackins worked for a local bank.

At a Buffalo church service where the Mackins’ daughter was to have been baptized Sunday, the Rev. George Woodruff called the shooting “just a senseless killing” and prayed for the victims — and the gunman.

“I know some people are not comfortable with that,” Mr. Woodruff said at Durham Memorial A.M.E. Zion Church. “I pray you arrest his spirit as only you can.”

Police identified the other three slain victims as Willie McCaa III, 26; Shawnita McNeil, 27; and Tiffany Wilhite, 32.