Were the deaths of a Pennsylvania pastor's two wives coincidence or murder?

When "48 Hours" first told you about Pastor A.B. Schirmer, the story ended in a cliffhanger. Schirmer stood accused of killing his second wife -- but there was no question about the death of his first wife. Could he have killed her, too? A lot has happened since we first aired this story. Now, we have the answers no one expected.

It was October 2008 when Rose Cobb learned of her brother's death.

"It was a horrible, shocking, traumatic thing to have somebody not only shoot themselves, but shoot themselves in a church," Rose Cobb said in tears. "I couldn't believe it."

Joe Musante died in the church office -- sitting at the pastor's desk--a single gunshot wound to the head. He left behind his wife of 18 years and two children.

"My brother was dead and I didn't know what happened to him," said Cobb.

Soon Cobb learned there were a lot of things she didn't know. When she arrived in the tiny town of Reeders, Pa., for her brother's memorial service, she noticed how quiet things were at Joe and his wife, Cindy's, house.

"And I asked Cindy about that. I said, 'How come there's nobody here?'" she said. "That's when she told us what was happening."

Cindy told Cobb what everyone else seemed to know: that she had fallen in love with her boss, A.B. Schirmer who was the family's pastor.

"First I asked her ... 'Are you having an affair?' And she said, 'Well, that depends on what you mean by an affair. And then she explained that is was emotional," Cobb explained.

"Well, I mean, I guess I just felt like she just was so in love with him," she replied.

It was the last thing Cobb expected to be talking about to her brother's widow on the eve of his memorial service.

"She was very giddy," Cobb explained. "Giddy. Yeah, very childlike.

Cobb was learning a lot about her sister-in-law's new boyfriend, Arthur Burton Schirmer, who most people called A.B. Cindy told her that three months before Joe's death, Pastor Schirmer's wife, Betty, died after a car crash.

"I said, 'what happened?' And she said, 'Well you know ... a deer ran out in front of the road. He swerved to miss the deer and - and hit the bridge or something like that, and she ended up dying,'" Cobb explained.

Rose was suspicious of all the deaths surrounding Pastor Schirmer. She dug deeper and learned Betty was Schirmer's second wife. His first wife, Jewel, had also died suddenly.

"She said, 'Oh, she fell down some stairs.' You know something about a sweeper or something," Cobb said. Really? She dies from falling down the stairs? And then the second wife dies from being in a car accident where the deer n