He only wants to be known as Gary for this story. He doesn't want anymore attention, but he believes by telling his story it will help him and others get through this tragedy.
"Our whole congregation is hurting right now. I think I can help because I cried enough," said Gary from his home Wednesday morning.
Sunday, Gary was serving as an usher with Doctor George Tiller at Reformation Lutheran Church, like he often does.
He said Scott Roeder had been coming to church at Reformation Lutheran off and on recently and attended services the Sunday and Saturday night before Tiller's death.
Instead of putting money in the collection basket, Gary said Roeder would put random notes inside, one asking "do you believe in taxes?"
"They were some random stuff. At the time I just blew it off. We didn't know why he was asking these things," Gary said.
Sunday, Gary was standing in the foyer with Tiller when he said Roeder came out of the service. He said he thought Roeder was going to the bathroom. He doesn't want to go into details about what happened next, but police say Roeder killed Tiller with a single gunshot and took off in his car.
"It's something I have to live with for the rest of my life. I don't like replaying it out all the time. I'll have to replay it, testify sometime, " said Gary.
Authorities arrested Roeder near Kansas City. Roeder's preliminary hearing is set for June 16.