MONROEVILLE, Pa. -- On Wednesday, a trial was under way for a woman that prosecutors said used fire to attack her lover in a Monroeville building.

Channel 11's Kimberly Easton reported that the woman is standing trial for attempted murder and remained calm and collected during opening statements, but broke down and cried when the jury left the courtroom.

The prosecution argued that 48-year-old Beverly Coon used Ladylock pastries laced with Temazepam, a powerful sedative, to drug her boyfriend, 61-year-old Ronald Grimm and said when he fell asleep Coon set his apartment on fire.

Easton reported that the two were married at the time, but were legally separated from their spouses and had an ongoing relationship, for two years.

According to assistant district attorney, Thomas Pratt, when Grimm threatened to break off the romantic relationship Coon formulated the plan to get rid of him.

"The defendant had motive and opportunity to commit that crime," said Pratt.

Grimm suffered second-degree burns to 70 percent of his body in the fire and doctors told investigators they found traces of the drug in his bloodstream.

The prosecution also pointed out that witnesses spotted Coon at the scene of the fire peering through the window of Grimm's apartment.

The defense agreed with the prosecution in this case that it was circumstantial and said that there's not evidence against his client in this case.