he said shepard had been stalking joe sonnier. narrator: detective johnson thought back to that flash richelle said she and joe saw one night at his house. narrator: and earlier that same day, she saw someone watching her in the parking lot outside her gym. narrator: dave shepard was a big guy, well over 6 feet tall and some 300 pounds. so it could have been him. even at night, i could see the man inside the car. narrator: and it wasn't just richelle who thought someone was watching her. debra hollowell, the dance instructor, told investigators she noticed a stranger watching her studio from a parking lot across the street. debra hollowell: right around that area over there. narrator: it was the studio where richelle and dr. sonnier went dancing. woman: i would see him outside quite often when i would take my smoke breaks, hiding behind a semi truck. i felt like he was just really staring over in our direction. narrator: her description could fit shepard as well. she said he was big and shaggy. he was just staring. and that gave me

plus, he was a respected doctor who had never even met joe sonnier. ective focused on some other possible leads richelle had mentioned. months before joe died, richelle received a bizarre letter. it was from someone rochelle had never heard of. a woman named tina. the money stopped, tina's letter said, and she was angry. joe adamantly denied knowing this person. joe also told his family about the letter. dallas sonnier: my dad's only reaction to that letter, immediate reaction, was, "that is not me. take that letter to the police right now." he was serious. because he was innocent of anything that letter stated. that letter was a farce. i mean, it's one thing to just say i didn't write that, i have no idea who this person is. it's another thing to swas a complete sham. andrea canning: the detective wanted to know more. the letter had been postmarked in lubbock, but since the mysterious woman gave no last name, there wasn't much to go on. so johnson turned to two other women who richelle thought might have a reason to harm joe. they were less mysterious