Funeral services for Garcia were to be held at the church, but after the shooting mourners were turned away by police.
"A coward walked into my family's church today", Neivia Choate, who identified herself as the bishop's niece, wrote in a Facebook post.
McMullen had a gunshot wound to the arm.
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The suspect - who has been charged with first-degree assault - was the stepson of pastor Luis Garcia, who was found dead in his home in Londonderry on October 1.
It is not yet clear what relationship the suspect had to either the wedding couple or those attending the ceremony. Brandon Castiglione, 24, was arrested and charged with second degree murder in Garcia's death, but waived an arraignment and is now being held without bail according to state prosecutors.
The service was canceled because of the shooting.
The State Police Major Crimes Unit and New Hampshire Attorney General's office will be taking over the investigation, according to Roark.
Pelham is a town of about 12,000 people 40 miles north of Boston.
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New Hampshire Sen. Maggie Hassan tweeted that she was "deeply disturbed" by the incident. Garcia worked at the church where Saturday's shooting took place.
The church's website indicates that a "men and women meeting" for Domestic Abuse Month was scheduled for 9:30am on Saturday.
New Hampshire Attorney General's office spokeswoman Kate Spiner says the office is aware of the situation and is working in conjunction with the Hillsborough County Attorney.
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