NASHVILLE, Tenn. -- Jerome Barrett’s parole officer said he still remembers their meetings after more than 30 years.

Video - Parole Officer: Meetings With Jerome Barrett Polite

Jack Curtiss said he remembered Barrett as soon as he saw the news.

“As soon as I saw his photograph on the news, I remembered him. … I remember it was always very polite. I want to use the term subdued, but it wasn't in a suppressive way,” he said.

According to information obtained by Channel 4 News, DNA evidence has also linked Barrett to Marcia Trimble’s death, though he has not been officially charged. Trimble was found dead about a month after disappearing in 1975. She was last seen delivering Girl Scout cookies in her Green Hills neighborhood.

Barrett was arrested in Memphis in November 2007 on charges stemming from the Sarah Des Prez case. Des Prez was found dead in her apartment by her father and brother.

He was released from prison in 2002 after serving 26 years for the rape of a Belmont student. According to records, Barrett was on parole for a sex offense when he raped her.

Curtiss was Barrett’s parole officer from August 1974 through March 1975, when Barrett was arrested and charged with raping the Belmont student.

Now that Barrett has been charged in the Des Prez case and DNA may link him to the Trimble case, Curtiss said he can't help but think back to the monthly meetings. The meetings would have been happening when a series of attacks were being reported.

“I've been kind of racking my brain to figure out when his reporting would have been in connection with when that happened,” he said.

In particular, Curtiss said he wonders about the Trimble case. Detectives once speculated that her killer placed her body in the garage long after she was slain. Curtiss said he can't stop thinking about it.

“I know I would have met with him a couple of times during that whole search period -- that period of time between the search and the discovery of the body. … Was she in the trunk of a car while he was upstairs in my office? Those are the things. It's not baffling. It's just weird,” he said.

Curtiss said there was nothing in Barrett's demeanor in 1974 that would have revealed the things of which he was capable.

Though they met regularly, he said you never really know what an offender is doing when you're not looking.

“I don't in any way feel like I missed anything or I should have noticed something. … Those things are usually so well hidden and subdued that even their mother doesn't know it,” he said.

One of the mysteries in the Trimble case is how could Barrett have gotten into her Green Hills neighborhood unnoticed?

Some have speculated he may have worked at Geddes Douglas Nursery, where one of the witnesses at the time said they had seen Trimble.

Curtiss said he remembers several offenders under his supervision who worked there, but he couldn't say for sure whether Barrett was one of them.