William Heck was standing at his daughter's grave in Cedar Hill Cemetery, digital recorder in hand. He felt a chill on his shoulder.

Later, when he pushed the recorder's play button, he heard what sounded like a little girl whispering:

"I'm touching you."

It's tough to be certain, but he believes the voice was that of his daughter, who died at age 4 of a chromosomal abnormality. He also believes she was touching him, just as the voice said.

"My shoulder was cold," said the Baltimore man, a member of the Pasadena Paranormal Society.

The society's mission is to find spirits just like Mr. Heck's...