Did you ever see that Batman with Heath Ledger?

You know that really super creepy grin he had?

When the defendant was in the courtroom, he would have a really creepy grin.

It looked like that to me. It was the oddest thing.

I'm Scott Weinberger, investigative journalist and former deputy sheriff.

I'm Anna Sige-Nikolazi, former New York City homicide prosecutor and host of investigation discoveries, true conviction.

And this is Anatomy of Murder.

It's September 5th, 1984, and Sharon Hayden Harvey, a 37-year-old mom returns home to her apartment after another long shift at work.

Sharon worked the night shift at the post office.

This is Lisa Callahan, assistant disc attorney for Tarant County, Texas.

So she got off in the wee hours of the morning and came home like she usually did.

Sharon lived in apartment complex in Fort Worth, Texas, which is part of the Dallas Metroplex.

As she was walking into the apartment, she's going down the hallway towards her bedroom.

As she walked past the bathroom, she noticed that there was some water on the floor that had something red in it, like it was stained red.

Sharon's 18-year-old daughter, Ginger, who lived with her, was entering her freshman year in college.

And she didn't think twice about it at the time because Ginger had told her that she had a jumpsuit that she wanted to die red.

And so she thought that Ginger had done that while she was at work.

So she grabbed a towel off the rack and tossed it on top of the puddle of water and went on into bed.

Sharon was living and struggling with multiple sclerosis or MS.

Her routine was to get into bed as early as she came home from work and get as much sleep as possible.

Then at 6.15am, Sharon was woken up by an alarm clock, but it wasn't her alarm clock.

Ginger's alarm was going on, and she wasn't turning it off.

...