The judge appointed public defenders for the Leonards. Those attorneys did not return phone calls seeking comment.
Shirley and the Leonard brothers face two counts of murder as well as 33 counts of arson - one count for each of the homes damaged so badly that officials have ordered their demolition.
Shirley and Mark Leonard, 43, also face two counts of conspiracy to commit arson, while Bob Leonard, 54, faces a single count. The conspiracy charges stem from a failed explosion that prosecutors claim the trio had attempted the weekend before the successful timed blast.
Prosecutor Terry Curry has said he will consider seeking the death penalty. A trial for all three suspects was scheduled for March 4.
"I think they should die a horrible death," Mosser said. "And it's terrible to have these feelings."
Investigators believe the suspects removed a gas fireplace valve and a gas line regulator in Shirley's house that subsequently filled up with gas. They have said a microwave, apparently set to start on a timer, sparked the explosion.
Reporters were positioned in the jury box so that the small courtroom could accommodate the 30 or so members of the public who squeezed in to observe the initial hearing.
Richmond Hills resident Barry Chipman said neighbors remained fearful of loud noises more than a month after the blast. He said he was driving with his teenage daughter recently when he popped the gum he was chewing and it "made her jump." A few minutes later, he said, she did the same, startling him.
"Everybody's still jumpy," he said.