Richard Schlesinger (48 Hours Correspondent)

Roger Harrington was a perfect patsy to set up for this crime.

Police believe Mark Winger began methodically plotting the double murder immediately after Donna's bizarre ride with Harrington on the way home from St.

Louis.

He's the perfect guy to seize on to make it look like an intruder had come in and killed his wife.

He fits Winger's purposes perfectly.

Correct.

The detectives could not afford any more errors.

After Deanne Schultz came forward, it took them two more years to cover every detail and put together a murder case against Mark Winger.

Finally, six years after his wife Donna was killed, Winger was arrested and put in jail awaiting trial.

Being a religious man like I am,

I haven't gloated on that.

I'm just glad that we've got the right guy in jail, that he didn't get away with it.

You haven't gloated, not even the teeny, tiniest bit?

I'm not a perfect Christian.

I'm not a perfect Christian.

Detective Charlie Cox, who once called Winger a hero, is now intent on proving him a cold-blooded murderer and vindicating the innocent man who was killed.

I hurt the Harrington family a lot.

They buried him as a murderer.

And yeah, that bothered me a lot.

But Mark Winger is just as determined to prove that the police got it right the first time.