Tiffany Becker

After all, her career was thriving, she was expecting a baby, and in January, she had turned 30 years old.

She booked a belated birthday cruise to the Bahamas to celebrate during spring break and invited her family and Cornelius.

I think when we started to see little changes is when we were on our vacation.

Jocelyn's mother, Lacey, and her aunt, Deidre, say Cornelius, who was usually the life of the party, seemed different.

He was just distant.

I mean, he was not attentive to our needs.

I mean, she's pregnant.

She's just looking very uncomfortable.

He's not trying to ensure that she's eating.

He's not trying to help her walking.

Even to look him in his face, he looked empty.

The whole time on the cruise, we're saying, what in the world is going on with them?

A week after the cruise, Jocelyn Peters was dead.

Investigators knew the crime scene held some intriguing clues.

In addition to the potato fragments discovered in her bedroom, authorities found a bag of potatoes on the dining room table.

Yeah, she was being very careful with her diet.

They would soon learn that Jocelyn had planned to go to the supermarket two days before Cornelius traveled to Chicago.

cornelius green told investigators at the crime scene that he had been in chicago when jocelyn was murdered and that he could prove it to investigators he goes i wasn't here i just came here straight from the amtrak station shows him an amtrak ticket almost immediately lead investigator mark biondolino and then he was very oddly specific on what time he got off the amtrak

In fact, this security footage from the St.

Louis train station shows Cornelius Green with luggage in tow returning on Thursday, March 24, 2016, approximately 12 hours after Jocelyn was murdered.